Inclusion criteria for HS patients :  Adult patients (≥18 years) Carrier of moderate to severe (Hurley grade ≥2) hidradenitis suppurativa of classical or gluteal phenotype Having an indication for surgical treatment (indication for excision) Not receiving immunomodulatory treatments (corticotherapy, biotherapy, apremilast, retinoids) or immunosuppressive treatments (methotrexate, ciclosporin) in the 6 months before inclusion, excluding antibiotics Agreement to participate Affiliated to social security  Inclusion criteria for control receiving abdominoplasty :  Adult patients (≥18 years) With no history of hidradenitis suppurativa or lesions suggestive of hidradenitis suppurativa (recurrent fold abscesses, recurrent fold suppuration, repeated draining in fold areas) With an indication for abdominoplasty surgery Not receiving immunomodulatory treatments (corticotherapy, biotherapy, apremilast, retinoids) or immunosuppressive treatments (methotrexate, ciclosporin) in the 6 months preceding inclusion, excluding antibiotics Agreement to participate Affiliated to social security  Criteria for non-inclusion of patients with HS :  Immunosuppression, autoimmune disease(s), cancerous disease, or acute or chronic infectious disease Difficulty understanding or reading French Patients already included in a therapeutic interventional trial Patients under guardianship or curatorship Pregnant or breast feeding women Syndromic hidradenitis suppurativa, hidradenitis suppurativa of follicular phenotype  Criteria for non-inclusion of controls receiving abdominoplasty :  Immunosuppression, autoimmune disease(s), cancerous disease, or acute or chronic infectious disease Difficulty understanding or reading french Patients already included in a therapeutic interventional trial Patients under guardianship or curatorship Pregnant or breastfeeding women