Apremilast monotherapy for palmoplantar pustulosis: Report of three cases.

Palmoplantar pustulosis or palmoplantar pustular psoriasis is chronic skin conditions, characterised by eruptions of sterile pustules on an erythematosquamous background. High-quality data on the treatment of palmoplantar pustulosis are limited, and none is accepted as being effective in general. Apremilast is a small molecule inhibitor of phosphodiesterase 4 approved for the treatment of plaque psoriasis and psoriatic arthritis. We report three cases of palmoplantar pustulosis treated with apremilast monotherapy. Our three cases, as well as previous reports, demonstrate the potential for apremilast to be beneficial for a subset of patients with palmoplantar pustulosis or palmoplantar pustular psoriasis.