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(A) A 5-year-old female patient complained of patchy hair loss since birth. (B) Trichoscopic view shows vellus hair (red arrow) and peripheral terminal hair (blue arrow). Diagnosis: Congenital triangular alopecia. (C) A 16-year-old female patient complained of patchy hair loss. (D) Trichoscopic view shows vellus hair (black arrow) and hair diameter diversity (red arrow) and single hair pilosebaceous unit (blue arrow). Diagnosis: Patchy androgenetic alopecia.
