<unk>  (also known as "Postoperative<unk> ," and<unk> -induced<unk> ") occurs in adults after prolonged<unk>  on the scalp during general anesthesia, with the head fixed in one position, and may also occur in chronically ill persons after prolonged bed rest in one position that causes persistent<unk>  on one part of the scalp, all likely due to<unk> -induced ischemia.
Pressure alopecia
Traction alopecia
Tar melanosis
Frictional alopecia
Triangular alopecia
Onychogryphosis
Melasma
Hypodermyasis