Does hair prevent acne? Insights from alopecia areata

Based on this hypothesis, the development of psoriatic lesions in our case may have been triggered by an increase in cytokines in the previous vitiliginous patches in a genetically susceptible patient. Unfortunately, no tissue cytokine profile was available for our patient. In this paper, we present an uncommon clinical feature with strict colocalization of psoriatic lesions in vitiliginous areas. The location could indicate a Köebner phenomenon in response to two different forms of injury: (i) the anatomical location in this case is a friction area due to a sitting position and (ii) psoriatic plaques may develop in areas of skin previously affected by vitiligo, in response to increased tissue levels of epidermal cytokines. Further studies to clarify any pathogenetic links between vitiligo and psoriasis are necessary.