Photoclinic Diagnosis: Follicular Mucinosis (Alopecia Mucinosa)

A16-year-old boy was visited because of a red, slightly elevated, and hairless 2 × 2 cm plaque on his occipital area that had appeared about 4 months before and enlarged gradually. The lesion caused no trouble for the patient. Examination for fungi had been negative. There was no improvement with administration of topical and systemic antibiotics. Physical examination showed no abnormal finding except the mentional lesion on scalp. Complete blood count, erythrocyte sedimentation rate, and chest X-ray were all normal. A skin biopsy was performed from the lesion and sent for histopathologic examination.