This is linear verrucous epidermal nevus, not acanthosis nigricans.
Khunger
Niti
N
Kathuria
Sushruta
S
D000052:Acanthosis Nigricans / Q000175:diagnosis; D003937:Diagnosis, Differential; D004817:Epidermis / Q000473:pathology; D006801:Humans; D009506:Nevus / Q000175:diagnosis*; D012878:Skin Neoplasms / Q000175:diagnosis*