Psoriasis, Vitiligo, and Biologic Therapy: Case Report and Narrative Review.

Psoriasis and vitiligo are 2 multifactorial immune-mediated diseases, partially sharing pathogenetic underpinnings. Their coexistence in the same patient, although uncommon, is documented in the literature. Further, several cases of vitiligo induced by biological drugs in psoriatic patients are reported. However, improvements in psoriasis and pre-existing vitiligo after the introduction of biological therapy are also described. To date, anti-TNF-alpha is the most cited group of biological drugs that induce new-onset vitiligo or progression of pre-existence vitiligo in psoriatic patients. Even anti-IL-12/23 class would seem to induce vitiligo (as in our case) or even worse it. Anti-IL-17 drugs induce a progression of pre-existing vitiligo while, to date, no cases are reported in literature considering anti-IL-23 class.