Successful treatment of co‐existent SAPHO syndrome and hidradenitis suppurativa with adalimumab and methotrexate

: SAPHO syndrome, namely Synovitis, Acne, Pustulosis, Hyperostosis and Osteitis, is a rare autoinflammatory chronic disease presenting with non-infectious inflammatory osteitis, sterile joint inflammation and skin manifestations, including palmoplantar pustulosis and severe acne. The case of a 15-year-old boy affected by SAPHO syndrome and hidradenitis suppurativa (HS) is presented and discussed. Coexistence of these two diseases may represent a therapeutic challenge and this case confirms literature data reporting the efficacy of the combination of methotrexate and adalimumab in SAPHO complicated by HS.