Isomorphism not seen in:: (A) Lichen planus, (B) Warts, (C) Psoriasis, (D) Vitiligo
Answer is D. Isomorphism or Koebner phenomenon-It means linear lesions produced by scratching a primary lesion which results in new lesions developing along the line of the scratch. Eg: Lichen planus, warts and psoriasis. But Koebner phenomenon is characteristic for Lichenplanus.