Figure 2: Scanning electron microscopy. (a) Proximal scalp hair with torsion and grooving (arrows) (×150). (b) Proximal scalp hair with important grooving (arrows) (×330). (c) Detail of a grooving in the proximal portion of scalp hair (arrows) (×1600). (d) Double grooving in the proximal scalp hair portion (arrows) (×220). (e) Unaffected distal portion of scalp hair showing only light weathering changes (×550)