Congenital Atrichia With Papular Lesions: A Rare Cause of Irreversible Childhood Alopecia

Congenital atrichia with papular lesions (APL) was identified as a rare cause of irreversible childhood alopecia in a 9-year-old boy who exhibited sparse body hair and a history of hair loss shortly after birth. The presence of multiple skin-colored papules on the scalp and biopsy results showing keratinous cysts and absence of hair follicles confirmed the diagnosis. Vitamin D-dependent rickets was ruled out, emphasizing congenital APL as a distinct cause of total alopecia.