Figure 1. True Koebner phenomenon: (A) In a patient with chronic plaque psoriasis. Appreciate the 'kissing' lesions of psoriasis developing along the natal cleft stemming from trivial friction-induced trauma; (B) In a patient with vitiligo vulgaris. Appreciate the linear depigmented macule over the back of patient (black arrow) with active vitiligo, which developed within a week of the patient having sustained a mild abrasion along that line; and (C) In lichen planus involving the neck fold of an adult man - Dermoscopic image highlighting the linearly arranged Wickham's striae (white structureless areas) for better clarity [Escope Videodermatoscope; 70X, polarized; Timpac Healthcare Pvt. Ltd.]. Contributed by Sidharth SOnthalia, MD, DNB, MNAMS