Follicular mucinosis (FM) is an uncommon reaction pattern in which the accumulation of mucin in the follicular epithelium is the pathologic finding. FM may be idiopathic (primary follicular mucinosis), in association with mycosis fungoides or cutaneous T-cell lymphoma, or in association with other neoplastic and inflammatory conditions. A 9-year-old girl with 1-year history of asymptomatic alopecic skin lesion was sent for a dermatologic consultation. The lesion exhibited slightly erythematous alopecic indurated plaque with follicular hyperkeratotic papule on philtrum. A biopsy specimen from the lesion demonstrated mild perifollicular lymphocytic infiltrate in papillary and reticular dermis with abundant mucin. Based on clinical and histopathologic finding, primary FM was diagnosed. Primary FM is the most common form of FM in children and has been considered to occur without association with MF or other cutaneous lymphoproliferative disorders. FM associated with MF was diagnosed on initial biopsy. Childhood FM has an excellent prognosis and although some cases may meet the diagnostic criteria for folliculotropic MF, it cannot be unequivocally regarded as early MF. Even in cases of confirmed MF, there is no evidence to support aggressive therapy. Long-term follow-up of children with AM/FM is nevertheless warranted.