Severe recalcitrant hidradenitis suppurativa in a 2-year-old boy with partial trisomy 13.

We report the case of a 2-year-old boy with mosaic trisomy 13 and immunodeficiency who developed severe hidradenitis suppurativa beginning at the age of 18 months. Unresponsive to standard therapies, he exhibited a partial response to immunoglobulin replacement therapy.