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This review examines the existing research on pathologic hairpulling, skin picking, and nail biting, suggesting these behaviors are underrecognized and may benefit from a unified diagnostic categorization; it reports no new clinical findings.

This case report highlights trichotillomania's distinguishing "tonsure pattern" and nail-biting, emphasizing the need to differentiate it from other hair loss types due to differing treatments.

This study found that trichotillomania was more common in younger people, particularly females, and was characterized by increased catagen hair without perifollicular inflammation.

Minoxidil increases nail growth more than biotin.

This article reviews the structural similarities and common disorders of hair and nails, highlighting their joint involvement in congenital and acquired conditions, but it reports no new clinical results.