Psoriasis Flare Following Interleukin-17 (IL-17) Inhibition and Recent Streptococcal Infection: A Case Report Highlighting Management Complexity.

Psoriasis is a chronic immune-mediated inflammatory skin disease that has a wide range of clinical manifestations. Biologic agents such as interleukin-17 (IL-17) inhibitors are increasingly used for the management of moderate-to-severe psoriasis due to their ability to achieve similar therapeutic outcomes with better safety profiles than conventional systemic treatments, such as methotrexate or cyclosporine. While typically safer, there is a rare possibility of these agents exacerbating psoriasis. Moreover, a psoriasis flare may occur from various causes, such as an adverse reaction to treatments or streptococcal infections. This case illustrates the complexity of managing psoriasis in patients who have contraindications to systemic treatments, are unresponsive to standard therapies, and may have potential complications from streptococcal infection. It highlights the need to consider multiple therapeutic approaches, including the use of phosphodiesterase 4 (PDE4) inhibitors. We discuss the case of a 37-year-old female with worsening of psoriasis following a streptococcal infection and treatment with ixekizumab.