Drug-induced alopecia areata?

Alopecia areata (AA) is a chronic, autoimmune disorder that results in non-scarring hair loss. Analysis of affected follicular unit in acute AA and regrowing white hair showed that the disease preferentially affected the hair bulb melanocytes and differentiating cortical keratinocytes respectively. Reports on sparing of senile white hair suggests that melanocytes in the hair follicle are favoured as the main target in the pathogenesis. The lifetime incidence of idiopathic alopecia areata (IAA) is approximately 2.1% but there is limited data on drug-induced alopecia areata (DIAA).