Secukinumab-induced paradoxical hidradenitis suppurativa.

Paradoxical reactions during treatment with biological agents may be defined as an appearance or exacerbation of a pathological condition that usually responds to this class of drug. Typical examples of paradoxical adverse effect are, among others, palmoplantar pustular and psoriasiform reactions or HS, in patients during a treatment of rheumatoid arthitis or IBD mainly. A few reports have been described an exacerbation of psoriasis1, palmoplantar pustular, or pustular psoriasis eruption with secukinumab. Marasca et al. highlights the immunological complexity that surrounds autoinflammatory diseases showing the potential double pathogenetic face of secukinumab in HS, describing a case of secukinumab-induced HS and a case of HS caused by adalimumab treatment and controlled by secukinumab therapy. Real world evidence and results from clinical trials with secukinumab for HS, will possibly show the real role that anti-IL-17 drugs play in this complex disease.