[Pemphigus vulgaris beginning as the Koebner phenomenon].

Pemphigus vulgaris is an autoimmune disease characterized by acantholysis and intraepidermal bullae formation. The isomorphic Koebner phenomenon is a response to different stimuli, and it has been described in many skin disorders. An association between the two has rarely been described. We present a case of pemphigus vulgaris that appeared over surgical scars. Pemphigus vulgaris over scars is very rare. In our case, the reactivation of the pemphigus antigens in the surgical scar probably caused a generalized autoantibody response, with the formation of bullae on the patient's trunk.