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Summary: Background. Pediatric cutaneous mastocytosis patients diagnosed and followed up by our specialist were enrolled in this study, and clinical and laboratory evaluations were retrospectively analyzed from patients' archived files. Methods. Patients, who applied to the Division of Pediatric Allergy And Immunology Unit of a University Training and Research Hospital between 01.01.2010 and 28.04.2021, were enrolled in this study. Results. Of the 33 patients included in the study, 11 (33.3%) were female and 22 (67.7%) were male. The median age of onset of the patient's complaints was 7 (0-60) months. The median age at diagnosis was 11 (2-64) months. Their complaints' median regression age was 54 (6-192) months. Resistant clinical findings were followed in 13 (39.4%) patients. Itching, redness, gastrointestinal symptoms, and maculopapular eruption were the most common complaints. The rashes were mostly polymorphic and larger than 1 cm. Heat was the most common trigger. Darier's sign was positive in 97% of the patients. Antihistamines were the most commonly used drug for prophylaxis and treatment. The autoinjector prescription rate was 24.2%. Conclusions. Quality of life was mildly affected in 48,5% of the patients based on the CDLQI scores. Thus, patients should be followed up through adolescence for the development of systemic signs and symptoms.

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A 2-year-old, male patient presented with an 18-month history of scattered, brown macules and nodules up to 2 cm in size on his trunk and extremities. These macules were accompanied by pruritus and were positive for Darier's sign. A skin biopsy of a brown macule on the left thigh revealed a dense accumulation of CD117-positive, round or oval cells with amphophilic cytoplasm within the upper to middle dermis. The patient was otherwise healthy and had normal laboratory and imaging test results. Sequence analysis of genomic DNA from a skin biopsy demonstrated the presence of an Asp419del mutation in exon 8 of the KIT gene. Based on these findings, maculopapular cutaneous mastocytosis (MPCM) was diagnosed. The patient received H 1-antihistamine. Although the pruritus resolved, the brown macules remained for one year after the initial treatment. To the best of our knowledge, only three cases of cutaneous mastocytosis (CM) with an Asp419del mutation, including the present case, have been reported in the Japanese literature to date; moreover, while the previous two cases were of DCM, the present case was the first instance of MPCM. Normally, the symptoms of childhood-onset MPCM are dormant until puberty. However, a recent study reported that many MPCM patients may experience persistent or exacerbated symptoms. The present study therefore evaluated 53 Japanese cases of childhood onset MPCM with a KIT gene mutation and discussed the patients' clinical outcomes.

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Mastocytosis are orphan diseases characterized by the accumulation of mast cells in one or more organs. A distinction is made between systemic forms (10 %) and pure cutaneous forms (90 %), the latter being mainly pediatric and generally having a spontaneously favourable prognosis. In the absence of a systemic sign, the diagnostic criteria for cutaneous mastocytosis are Darier's sign, in principle, pathognomonic, as well as skin histology confirming mast cell infiltration. The treatment is essentially preventive (avoidance of factors triggering degranulation) and symptomatic (antihistamine agents).

Les mastocytoses sont des maladies orphelines caractérisées par l'accumulation de mastocytes dans un ou plusieurs organes. On distingue les formes systémiques (10 %) des formes cutanées pures (90 %). Ces dernières sont principalement pédiatriques et ont, généralement, un pronostic spontanément favorable. En cas d'absence de signe d'appel systémique, les critères de diagnostic de mastocytose cutanée sont le signe de Darier, en principe, pathognomonique ainsi que l'histologie cutanée affirmant l'infiltration mastocytaire. Le traitement est essentiellement préventif (éviction des facteurs déclenchant la dégranulation) et symptomatique (médicaments antihistaminiques).

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INTRODUCTION: Cutaneous plasmacytosis is a rare skin condition first described in 1976 and it is seen mainly in patients of Asian descent. Patients usually present with multiple reddish-brown macules and nodules chiefly on the trunk and face, with clusters of well-differentiated plasma cells in the dermis. The aetiopathogenesis and nosological features of this entity remain obscure. We report herein a case of cutaneous plasmacytosis in a European middle-aged woman with presence of Darier's sign. PATIENTS AND METHODS: A 56-year-old woman of European descent presented with asymptomatic hyperpigmented patches affecting the dorsal aspect of her trunk for at least two years. Darier's sign was present in some episodes. Cutaneous biopsy showed a moderately dense interstitial and perivascular infiltrate containing numerous well-differentiated mature plasma cells affecting the entire dermal surface. Kappa and lambda immunochemistry demonstrated polyclonal plasma cell infiltrates with absence of light-chain restriction. Immunohistochemical examination was negative for HHV-8 and Treponema pallidum spirochetes. Laboratory findings revealed hypergammaglobulinaemia with no monoclonal bands being detected on immunofixation. A diagnosis of cutaneous plasmacytosis was made. In the absence of systemic involvement initial management consisted of clinical surveillance. DISCUSSION: The characteristic clinico-pathological features of CP allowed diagnosis of this skin condition in our patient, although it is very rarely reported in patients of European descent. The main differential diagnoses were ruled out, namely plasmacytic infiltrates related to infections and marginal B-cell lymphoma.

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Urticaria pigmentosa is the most common form of mastocytosis that often develops in infancy or early childhood. We report two male children- first, a 7-month-old child with a history of asymptomatic multiple dark colored skin lesions macules with wheals on gentle rubbing (Darier's sign) and second, a 2-year-old child with similar clinical presentation without Darier's sign. Dermoscopy showed dark brown lines in a reticulate pattern which is an exaggeration of the pigment network seen in the normal skin. The reticulate pigment network was darker and thicker in the child with positive Darier's sign. This is the first case report of dermoscopy of urticarial pigmentosa with and without Darier's sign reported in skin of colour.

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BACKGROUND: The diagnosis of solitary cutaneous mastocytoma is mainly clinical, based on lesion morphology, the presence of a positive Darier sign, and the absence of systemic involvement. Knowledge of this condition is important so that an accurate diagnosis can be made. OBJECTIVE: To familiarize physicians with the clinical manifestations, diagnosis, evaluation, and management of a solitary cutaneous mastocytoma. METHODS: A PubMed search was completed in Clinical Queries using the key term "solitary cutaneous mastocytoma". The search strategy included meta-analyses, randomized controlled trials, clinical trials, observational studies, and reviews. Only papers published in English language were included. The information retrieved from the above search was used in the compilation of the present article. RESULTS: Typically, a solitary cutaneous mastocytoma presents as an indurated, erythematous, yellow- brown or reddish-brown macule, papule, plaque or nodule, usually measuring up to 5 cm in diameter. The lesion often has a peau d'orange appearance and a leathery or rubbery consistency. A solitary cutaneous mastocytoma may urticate spontaneously or when stroked or rubbed (Darier sign). Organomegaly and lymphadenopathy are characteristically absent. The majority of patients with skin lesions that erupt within the first two years of life have spontaneous resolution of the lesions before puberty. Treatment is mainly symptomatic. Reassurance and avoidance of triggering factors suffice in most cases. CONCLUSION: The diagnosis is mainly clinical, based on the morphology of the lesion, the presence of a positive Darier sign, and the absence of systemic involvement. A skin biopsy is usually not necessary unless the diagnosis is in doubt.

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Cutaneous mastocytosis is a disease characterized by the infiltration and proliferation of mast cells in the skin. In children, the most common form of presentation is urticaria pigmentosa, while the diffuse cutaneous bullous mastocytosis is one of the rarest subtypes seen. The aim of this paper is to present a case of diffuse bullous mastocytosis with detection of IgM deposits at dermo-epidermal junction using direct immunofluorescence (DIF) microscopy. The diagnosis of diffuse bullous mastocytosis is a challenge, and DIF microscopy is necessary in order to exclude an autoimmune bullous disorder. However, IgM deposits at dermo-epidermal junction can be nonspecific, being found in a variety of skin disorders. A 6-month-old girl presented with bullous lesions and erosions on the scalp and the trunk. During hospitalization, further bullous lesions appeared, along with generalized erythrodermia. Skin biopsy revealed aspects of urticaria pigmentosa. Taking into account the clinical findings, the case was enclosed as bullous mastocytosis. Treatment included the avoidance of trigger factors, and administration of antihistamines along with a short-term course of systemic steroids. The evolution was favorable, with remission of the existing lesions and without occurrence of new ones.

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Se presenta una niña de 16 meses de edad, con una lesión de catorce meses de evolución que consistía en una única placa eritematosa, en forma de L, bien delimitada, localizada en la parte superior de la espalda. El signo de Darier fue positivo. La histopatología mostró edema intersticial y en la tinción con Giemsa, se observaron mastocitos. Se realizó el diagnóstico de un mastocitoma solitario. El mastocitoma solitario es una lesión tumoral benigna, que representa aproximadamente el 15% de la mastocitosis cutánea.(AU)

We report a 16 month years old female, with a 14 months history of a single erythematous, L shaped well-delimited plaque located on her upper back. Darier sign was positive. Histopathology revealed interstitial edema. The Giemsa staining showed mast cells. The diagnosis of a solitary mastocytoma was performed. Solitary mastocytoma is a benign tumoral lesion, that represents approximately 15% of cutaneous mastocytosis.(AU)

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Se presenta una niña de 16 meses de edad, con una lesión de catorce meses de evolución que consistía en una única placa eritematosa, en forma de L, bien delimitada, localizada en la parte superior de la espalda. El signo de Darier fue positivo. La histopatología mostró edema intersticial y en la tinción con Giemsa, se observaron mastocitos. Se realizó el diagnóstico de un mastocitoma solitario. El mastocitoma solitario es una lesión tumoral benigna, que representa aproximadamente el 15% de la mastocitosis cutánea.

We report a 16 month years old female, with a 14 months history of a single erythematous, L shaped well-delimited plaque located on her upper back. Darier sign was positive. Histopathology revealed interstitial edema. The Giemsa staining showed mast cells. The diagnosis of a solitary mastocytoma was performed. Solitary mastocytoma is a benign tumoral lesion, that represents approximately 15% of cutaneous mastocytosis.

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A 50-day-old female child presented with asymptomatic skin colored raised lesion on the dorsal aspect of the left wrist since the age of 10 days. The diagnosis of cutaneous mastocytoma was made based upon clinical and histopathological features.

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Systemic mastocytosis (SM) is a rare, heterogeneous disorder characterized by infiltration and accumulation of mast cells within multiple organs, most commonly the skin. Given the rarity of the disease and the fact that many of its symptoms are shared by more common disorders, a diagnosis may be delayed or hindered. These patients have an elevated risk of developing potentially life-threatening anaphylactoid reactions, thus underscoring the importance of keeping SM in mind as a differential diagnosis when a patient presents with chronic, itchy skin lesions and a history of multiple allergic reactions to bites, drugs, and anesthesia. We present a case illustrating that features of SM common to many disorders may hinder or delay its diagnosis.

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A 2-month-old female infant was referred to DebRA Mexico from the Regional Children's Hospital because of a generalized dermatosis from birth characterized by multiple blisters and erosions on the trunk, face and limbs, associated with minor trauma. A skin biopsy showing subepidermal blisters associated with a dermal infiltrate of Giemsa-positive cells and CD117-positive antibody was consistent with the diagnosis of bullous mastocytosis. Treatment with oral antihistamines, topical steroids, and antibiotics was initiated, leading to a remission of the lesions.

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El mastocitoma solitario es la segunda en frecuencia, de las variantes de las mastocitosis, caracterizada por una proliferación de los mastocitos tisulares que afecta únicamente a la piel, comúnmente congénita o de aparición en las primeras semanas de vida, con etiología aún desconocida y buen pronóstico, ya que tiene una resolución espontánea en la adolescencia. Presentamos el caso de un paciente quien desde su nacimiento, presentaba una placa en antebrazo derecho, con signo de Darier negativo y asintomatomática. Con los datos clínicos y los antecedentes personales se realiza biopsia de piel, mediante la que confirmamos el diagnóstico de mastocitoma solitario.(AU)

Solitary mastocytoma is the second most frequent disease within mastocytosis. It is characterized by a hyperplasia of the mastocitos tissue that affects only the skin. It is usually congenital though it can also appear in the first weeks of life, with unknown etiology; it has a good prognosis due to its spontaneous resolution in the adolescence. This paper presents case of a patient who, from birth, has had some plaque in his right forearm, with negative and asymptomatic Dariers sign. The skin biopsy has been performed with clinical data and personal history, thus confirming the diagnosis of solitary mastocytoma.(AU)

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El mastocitoma solitario es la segunda en frecuencia, de las variantes de las mastocitosis, caracterizada por una proliferación de los mastocitos tisulares que afecta únicamente a la piel, comúnmente congénita o de aparición en las primeras semanas de vida, con etiología aún desconocida y buen pronóstico, ya que tiene una resolución espontánea en la adolescencia. Presentamos el caso de un paciente quien desde su nacimiento, presentaba una placa en antebrazo derecho, con signo de Darier negativo y asintomatomática. Con los datos clínicos y los antecedentes personales se realiza biopsia de piel, mediante la que confirmamos el diagnóstico de mastocitoma solitario.

Solitary mastocytoma is the second most frequent disease within mastocytosis. It is characterized by a hyperplasia of the mastocitos tissue that affects only the skin. It is usually congenital though it can also appear in the first weeks of life, with unknown etiology; it has a good prognosis due to its spontaneous resolution in the adolescence. This paper presents case of a patient who, from birth, has had some plaque in his right forearm, with negative and asymptomatic Darier's sign. The skin biopsy has been performed with clinical data and personal history, thus confirming the diagnosis of solitary mastocytoma.

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El objetivo de esta publicación es mostrar un caso de mastocitoma solitario en la vejez, debido a la rareza de su aparición en tal etapa. Sus diagnósticos diferenciales y la involución total de la lesión con el uso de apósitos hidrocoloides, son comentados.

We present a case of a solitary mastocytoma in a man 86 years old who developped the lesion on the inferior lip. The interest of the case is the rarity of the presentation in an adult, which presents others differential diagnostics, and the success of the treatment with hidrocolloid dressings.

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