Many faces of Koebner phenomenon in psoriasis.

Two patients with unusual skin stimuli causing koebner phenomenon in psoriasis are reported. First patient, a 33-year-old man, had psoriasis and multiple keloids for the last 26-years. At few places, the lesions of psoriasis and multiple keloids for the last 26-years. At few places, the lesions of psoriasis healed with keloid formation, and psoriatic plaques appeared selectively on the top of the keloids in addition to palms, soles and scalp. In the second patient (a 67-year -old man), the psoriatic lesions appeared at the site of healing herpes zoster lesions. Koebner phenomenon in psoriasis due to herpes zoster or varicella is rare, while that due to keloid has not been reported.