“…On the basis of these observations, we speculated the efficacy of topical tacrolimus in nail psoriasis, which often represents an isolated clinical presentation of the disease and is very difficult to treat. Moreover, previous studies had already shown that tacrolimus ointment may penetrate the periungueal skin enough to improve a nail dystrophy 8–12 . In fact, it was successfully used to treat nail dystrophy associated with chronic paronychia, 8 eczema 9 and lichen planus 10,11 and in a case of median canaliform nail dystrophy 12 …”