Leprosy and psoriasis co-existence.

Psoriasis and leprosy are almost mutually exclusive, with the prevalence of psoriasis in leprosy patients being as low as 0.014%. We present a case of a patient of psoriasis who was treated and developed Leprosy. We also did a review on the hypothesis which states that psoriasis protects from clinical progression of leprosy, and that leprosy was contained because of increase in prevalence of psoriasis. This inverse phenomenon is supported from our review but needs genetic and paleoepidemiological confirmation.