A large number of autoimmune and fibrosing conditions associated with psoriasis and morphea have been reported in the literature. Currently, the relationship between psoriasis and morphea is unknown, and the coexistence of these conditions is quite rare. Due to the few patients affected by both conditions, and the lack of knowledge concerning their pathogenic mechanisms, the cause behind this co-occurrence is poorly understood. Here, we present a case of morphea under a plaque of psoriasis in a patient managed on ustekinumab.