Kaposi's Varicelliform Eruption After Treatment With Ixekizumab in a Patient With Pityriasis Rubra Pilaris.

Pityriasis rubra pilaris (PRP) is a rare condition characterized by red-orange plaques with islands of sparing with follicular and palmoplantar hyperkeratosis. The disease can be difficult to treat and often requires patients to trial multiple therapeutic options. In recent years, targeted biologic therapies have increasingly been trialed due to their relative efficacy and favorable safety profile. Ixekizumab, an interleukin-17 inhibitor, is one such therapy that has demonstrated efficacy in PRP with few reported adverse events. We present a PRP patient who developed Kaposi's varicelliform eruption followed by a pseudomonal superinfection three months after initiation of ixekizumab.