RESUMEN

A sixty years postmenopausal lady presented with growing longer eyelashes for 8 years. She had thick, dark, curly eyelashes measuring 23 mm and 15 mm at the centre and periphery respectively suggesting marked trichomegaly. Increased vellus hair was noticed above lips and chin suggesting hypertrichosis. An important clue in history was the use of chemotherapeutic agent Erlotinib after bronchoscopic surgery for non-small cell lung carcinoma for the past 8 years. Erlotinib competitively binds to the tyrosine kinase domain of Epidermal Growth Factor Receptor inhibiting receptor activation and blocking the signal transduction. Thus, disrupting the transition of hair growth from anagen to telogen phase, leading to aberrant anagen phase and consequently abnormal hair growth. Trichomegaly is seen after 2-5 months of treatment. Mostly innocuous, it can lead to eyelid infections and rarely corneal ulceration. EGFR inhibitors are associated with hypertrichosis in other areas, as was the case in this patient. This case highlights the significance of detailed history including drugs, thus abating additional work-up for trichomegaly.