This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
Koebner phenomenon is characteristic of 
Select and explain. 
A. Psoriasis, B. Pemphigus, C. Pityriasis roscea, D. Lupus vulgaris
A: Psoriasis
Answer: A: Psoriasis 
Explanation: Koebner's phenomenon or isomorphic phenomenon is a term applied when localized non-specific trauma provokes lesions of dermatosis. It is seen characteristically in psoriasis, lichen planus, and vitiligo. Symptoms of Koebner phenomenon Koebner noted that some people with psoriasis developed lesions in areas in which the skin had been traumatized. This could be from a cut, a bruise, or a burn. Lesions may also develop on pas of the body where the skin is irritated by a waistband, belt buckle, or bra strap. In all these cases, the lesions appeared in areas outside of the usual spots affected by psoriasis Pseudo Koebner phenomenon seen in molluscumcontagiosum and was (Ref: Harrison 20th edition pg 1267