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BACKGROUND: MEK inhibitors cause a wide spectrum of mucocutaneous toxicities which can delay or interrupt life-saving therapy. PURPOSE: To summarize the morphology, incidence, and clinical presentation of mucocutaneous toxicities from MEK inhibitors via a scoping review of the literature. METHODS: We conducted a scoping review of the published literature, including clinical trials, retrospective and prospective studies, reviews, and case reports and series. All included literature was analyzed by a panel of pediatric and adult oncodermatologists. RESULTS: Of 1626 initial citations, 227 articles met final inclusion criteria. Our review identified follicular reactions, ocular toxicities, xerosis, eczematous dermatitis, edema, and paronychia as the most common mucocutaneous side effects from MEK inhibitor therapy. Grade 1 and 2 reactions were the most prevalent and were typically managed while continuing treatment; however, grade 3 toxicities requiring dose reductions or treatment interruptions were also reported. CONCLUSION: Mucocutaneous toxicities to MEK inhibitor therapy are common and most often mild in severity. Early recognition and treatment can mitigate disruptions in oncologic therapy.

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Dermatologists routinely see patients with inflammatory skin conditions and aesthetic concerns that involve substantial psychological comorbidity. However, most dermatologists do not receive formal training in this area, and many are unsure how to best help treat certain patients holistically. Body dysmorphic disorder (BDD) is a common and distressing psychiatric condition that disproportionately impacts dermatology patients, including patients living with chronic inflammatory skin conditions such as acne and atopic dermatitis. BDD is characterized by preoccupation with nonexistent or minimally noticeable flaws in physical appearance that cause clinically significant distress or impairment in functioning. Adolescent populations may be particularly vulnerable to clinically significant body image dissatisfaction, including BDD, due to the high prevalence of acne and the pervasive role of social media platforms. The rise of social media may exacerbate body image issues through repetitive exposure to idealized and often unrealistic beauty standards. Though screening questionnaires can assist dermatologists in recognizing BDD, dermatologists must collaborate with mental health providers to provide comprehensive care to vulnerable patients, including adolescents.J Drugs Dermatol. 2024;23(7):545-550.  doi:10.36849/JDD.8156.

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BACKGROUND: Lipid metabolism plays essential roles in skin barrier formation and the regulation of skin inflammation. Moreover, lipid homeostasis regulates skin melanogenesis, although the underlying mechanism remains largely unknown. Sterol regulatory element binding protein 1 (SREBP-1) is a key transcription factor essential for cellular lipid metabolism. Loss-of-function variants in SREBF1 are responsible for autosomal-dominant ichthyosis follicularis, alopecia, and photophobia syndrome, emphasizing the significance of lipid homeostasis in skin keratinization. OBJECTIVES: To identify the genetic basis of a new entity featuring diffuse skin hyperpigmentation with congenital cataracts, and to unravel the underlying mechanism for the pathogenesis of the SREBF1 variant. METHODS: Whole-exome sequencing was performed to identify the underlying genetic variants. Quantitative PCR, western blot, and immunofluorescent staining were employed to assess the expression and the subcellular localization of the SREBF1 variant. The transcriptional activity of the mutant SREBP-1 was determined by luciferase reporter assay. A transgenic zebrafish model was constructed. RESULTS: Two patients of different ethnicities presented with generalized skin hyperpigmentation with skin xerosis, congenital cataracts, and extracutaneous symptoms. We identified a de novo nonsense variant c.1289C>A (p.Ser430*) in the SREBF1 gene in both patients. The variant encoded a truncated protein which showed preferential nucleus localization, in contrast to wild-type SREBP-1 which is mainly localized in cytoplasm in sterol-sufficient conditions. Luciferase reporter assay revealed that the Ser430* mutant exhibited an enhanced transcriptional activity. The primary cultured melanocytes from the patient showed increased melanin synthesis compared to those from normal controls. The Ser430* transgenic zebrafish model exhibited more black spots, along with upregulated expression of melanogenic genes at 35 days post-fertilization. CONCLUSIONS: We demonstrated that a gain-of-function variant in SREBF1 caused a previously undescribed disorder characterized by generalized skin hyperpigmentation and congenital cataracts. Our study reveals the involvement of SREBP-1 in melanogenesis and lens development and paves the way for developing novel therapeutic targets for skin dyspigmentation or cataracts.

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Monogenic diseases of immune dysregulation should be considered in the evaluation of children presenting with recurrent neutrophilic dermatoses in association with systemic signs of inflammation, autoimmune disease, hematologic abnormalities, and opportunistic or recurrent infections. We report the case of a 2-year-old boy presenting with a neutrophilic dermatosis, found to have a novel likely pathogenic germline variant of the IKAROS Family Zinc Finger 1 (IKZF1) gene; the mutation likely results in a loss of function dimerization defective protein based on reports and studies of similar variants. IKZF1 variants could potentially lead to aberrant neutrophil chemotaxis and development of neutrophilic dermatoses. Long-term surveillance is required to monitor the development of hematologic malignancy, autoimmunity, immunodeficiency, and infection in patients with pathogenic IKZF1 germline variants.

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The rate of pediatric hospitalization for cutaneous pathology has been increasing in recent years, often requiring the expertise of consulting pediatric dermatologists; however, the infrastructure of inpatient pediatric dermatology consultative services remains poorly characterized. We sought to assess the structure, consult volume, physician compensation, and utilization of teledermatology in pediatric dermatology inpatient services to better understand the current care model. Our survey of 118 pediatric dermatologists revealed that 89% of respondents see between 1 and 10 new consults per week, 39% perform all inpatient consults including evening and weekends without assistance from other providers, 71% do not have protected time during the week to provide inpatient consultations, and only 10% receive financial compensation via stipend. By highlighting both the high demand for pediatric consultative dermatology as well as the significant burden placed on these providers by existing practice models, we hope to encourage a reappraisal of the current infrastructure of pediatric inpatient dermatology to increase structural and financial support for this vital service.

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Across the world, there are varied cultural practices applied in the newborn period that pediatric dermatologists need to be familiar with. This report details a 9-day-old girl who presented with black, spike-like hairs across the back after her mother had been rubbing breast milk on her back in a circular motion for the first 7 days of life. On dermatoscopic exam, these lesions were found to be tight bundles of lanugo hairs, consistent with a diagnosis of knotted lanugo. Improved understanding of cultural practices and newborn skin care routines is critical for diagnosis, treatment, and counseling.

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Poliosis is defined as the absence of melanin in hair, and hair graying typically occurs with hair melanin reduction. Poliosis can occur at any age but presents in childhood in certain genetic and acquired conditions, with many families seeking evaluation from a pediatric dermatologist. Poliosis presents as white hair typically restricted to a certain location of the scalp. Children may also present with a reduction of expected hair pigmentation, referred to as pigment dilution, or the development of hair graying. This review aims to provide a streamlined diagnostic approach for pediatric dermatologists when presented with these hair findings. Poliosis should be recognized as a potential diagnostic feature or initial sign in many syndromes and thus can guide clinicians in diagnosing and managing conditions earlier in a patient's care. Since many of the genetic and acquired conditions that present with poliosis or hair pigment dilution have extracutaneous manifestations, early diagnosis is vital in establishing multidisciplinary care.

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This case series describes the outcomes among adolescent patients with systemic lupus erythematosus and refractory discoid lupus erythematosus treated with anifrolumab.

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PURPOSE OF REVIEW: This review provides updates in the evaluation and management of key dermatologic diseases encountered in the hospitalized child. RECENT FINDINGS: Our understanding of dermatologic disorders in children continues to evolve. Staphylococcal scalded skin syndrome (SSSS) is a potentially severe blistering disorder typically seen in children under the age of 4 with an incidence that is increasing in the United States. Recent research has highlighted that the majority of cases are due to methicillin-sensitive Staphylococcus aureus (MSSA) and most patients can be adequately managed with beta-lactams. Toxic epidermal necrolysis (TEN) is one of the most feared dermatologic disorders. Currently, there is a lack of consensus on the most efficacious first-line systemic therapy. Etanercept is increasingly being used based on studies showing a shorter time to re-epithelization and decreased mortality. Lastly, the COVID-19 pandemic introduced the novel inflammatory condition multisystem inflammatory syndrome in children (MIS-C) in which approximately three out of four children present with a mucocutaneous eruption. Early recognition of the dermatologic features of MIS-C is important in potentially establishing a diagnosis and differentiating it from the many other causes of childhood fever and rash. SUMMARY: There are no clear universal treatment guidelines for these rare diagnoses, and therefore, clinicians must remain informed of the latest findings in diagnosis and therapeutics.

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Importance: Morphea is an insidious inflammatory disorder of the skin and deeper tissues. Determining disease activity is challenging yet important to medical decision-making and patient outcomes. Objective: To develop and validate a scoring tool, the Morphea Activity Measure (MAM), to evaluate morphea disease activity of any type or severity that is easy to use in clinical and research settings. Design, Setting, and Participants: This pilot diagnostic study was conducted from September 9, 2019, to March 6, 2020, in 2 phases: development and validation. During the development phase, 14 morphea experts (dermatologists and pediatric dermatologists) used a Delphi consensus method to determine items that would be included in the MAM. The validation phase included 8 investigators who evaluated the tool in collaboration with 14 patients with pediatric morphea (recruited from a referral center [Medical College of Wisconsin]) during a 1-day in-person meeting on March 6, 2020. Main Outcomes and Measures: During the development phase, online survey items were evaluated by experts in morphea using a Likert scale (score range, 0-10, with 0 indicating not important and 10 indicating very important); agreement was defined as a median score of 7.0 or higher, disagreement as a median score of 3.9 or lower, and no consensus as a median score of 4.0 to 6.9. During the validation phase, reliability (interrater and intrarater agreement using intraclass correlation coefficients), validity (using the content validity index and κ statistics as well as correlations with the modified Localized Scleroderma Severity Index and the Physician Global Assessment of Activity using Spearman ρ coefficients), and viability (using qualitative interviews of investigators who used the MAM tool) were evaluated. Descriptive statistics were used for quantitative variables. Data on race and ethnicity categories were collected but not analyzed because skin color was more relevant for the purposes of this study. Results: Among 14 survey respondents during the development phase, 9 (64.3%) were pediatric dermatologists and 5 (35.7%) were dermatologists. After 2 rounds, a final tool was developed comprising 10 items that experts agreed were indicative of morphea activity (new lesion in the past 3 months, enlarging lesion in the past 3 months, linear lesion developing progressive atrophy in the past 3 months, erythema, violaceous rim or color, warmth to the touch, induration, white-yellow or waxy appearance, shiny white wrinkling, and body surface area). The validation phase was conducted with 14 patients (median age, 14.5 years [range, 8.0-18.0 years]; 8 [57.1%] female), 2 dermatologists, and 6 pediatric dermatologists. Interrater and intrarater agreement for MAM total scores was good, with intraclass correlation coefficients of 0.844 (95% CI, 0.681-0.942) for interrater agreement and 0.856 (95% CI, 0.791-0.901) for intrarater agreement. Correlations between the MAM and the modified Localized Scleroderma Severity Index (Spearman ρ = 0.747; P < .001) and the MAM and the Physician Global Assessment of Activity (Spearman ρ = 0.729; P < .001) were moderately strong. In qualitative interviews, evaluators agreed that the tool was easy to use, measured morphea disease activity at a single time point, and should be responsive to changes in morphea disease activity over multiple time points. Conclusions and Relevance: In this study, the MAM was found to be a reliable, valid, and viable tool to measure pediatric morphea activity. Further testing to assess validity in adults and responsiveness to change is needed.

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Morbilliform eruptions inspire a broad and varied differential spanning across inflammatory and infectious categories. The goal of this article is to help the clinician develop an approach toward the pediatric patient with a morbilliform eruption in the emergency room or hospital setting. The authors review several high-yield clinical scenarios with a focus on recently emerging and reemerging childhood diagnoses.

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Variants in RAS are known drivers of certain pediatric blood and solid cancers, including brain tumors. Though most RAS-driven cancers are thought to occur sporadically, genetic syndromes caused by germline RAS variants portend a slightly higher risk of rhabdomyosarcoma (RMS) development. Three new cases and a review of the literature demonstrate that in rare cases, certain somatic RAS variants are associated with an increased risk of RMS and that RMS development may be heralded by the presence of concomitant RAS-driven birthmarks. Further prospective studies are needed to establish incidence and recommend appropriate monitoring guidelines for patients at risk.

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Pediatric oncologists are increasingly involved in the management of benign vascular tumors and their associated life-threatening complications. Hemangiomas are the most common referring diagnosis to multidisciplinary vascular anomalies clinics. However, as contemporary research has revealed, hemangiomas are not a single, easily defined entity but rather a diverse set of related vascular tumors, each having a unique natural history, growth pattern, and response to therapy. This manuscript seeks to illustrate how we evaluate and manage these complex tumors, their complications, and associated syndromes, while remaining ever vigilant for malignant hemangioma mimickers such as soft tissue sarcomas and congenital leukemia.

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BACKGROUND: Primary care providers (PCPs), including pediatricians and general practitioners, are often the first to see children with eczema/atopic dermatitis (AD). Little is known about management of pediatric AD by PCPs and adherence to national guidelines. OBJECTIVE: To review existing literature examining management components of pediatric AD (topical corticosteroids [TCS], topical calcineurin inhibitors [TCIs], antihistamines, bathing, emollients, and diet) by PCPs. DATA SOURCES: PubMed/Medline and Embase. STUDY ELIGIBILITY CRITERIA: English-language articles dated 2015 to 2020 reporting outcomes addressing management of pediatric AD by PCPs. STUDY APPRAISAL AND SYNTHESIS METHODS: Two authors independently screened titles/abstracts, reviewed full-text articles, extracted relevant data, and evaluated study quality. Disagreements were resolved by a third author. RESULTS: Twenty articles were included. Surveys and national database analyses were the most common methodologies (n = 7 each). PCPs commonly prescribed TCS but had a preference for low-potency agents, overprescribed nonsedating antihistamines, and avoided TCIs. PCPs commonly recommended emollients, although this was not universal. Data characterizing nonmedication management were limited. LIMITATIONS: Most studies did not examine individual patient encounters, but rather relied on providers reporting their general behaviors. Provider behavior may vary based on country of practice. CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS: Knowledge and management gaps exist among PCPs in treating pediatric AD in key areas including knowledge of TCS safety profiles and prescribing of TCIs. The current literature is largely limited to small studies that evaluate prescribing behaviors with limited data characterizing nonmedication management, highlighting the need for future research in this area.

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PURPOSE OF REVIEW: Photograph-based social media use among children and adolescents has skyrocketed over the past decade, raising concerns about the implications for self-confidence and behavior in this population. Social media 'challenges' encourage participants to complete potentially dangerous tasks while sharing their completion of the tasks on social media. Many of these challenges affect the skin and lead to recognizable findings on physical examination. This review discusses the history of prominent social media challenges and their effects on the skin. Attention is also given to the effects of social media trends on self-confidence and body image in children and adolescents. RECENT FINDINGS: Over the past several years, there have been several notable social media trends that can harm the skin. These include the Kylie Jenner lip challenge, salt and ice challenge, deodorant challenge, eraser challenge, fire challenge, and hot water challenge. Participation in these challenges can cause morbidity in children and adolescent that should be recognized by clinicians. SUMMARY: Social media has become an important platform for communication and self-expression among children and adolescents. Pediatricians should remain aware of social trends in this age group and look out for cutaneous findings that may signal dangerous behavior on social media.

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