A, Prevalence of various sites of cutaneous involvement according to genotype. Carriers of the deletion were more likely to have disease that affected the scalp, neck, breasts, and antecubital fossa. B, A patient with hidradenitis suppurativa who was heterozygous for the NCSTN deletion variant demonstrated inflamed nodules and abscess in the nuchal area and torso. C-E, Antecubital involvement in increasing degrees of severity.