The chronic skin illness named as hidradenitis suppurativa, or HS, is characterized by the formation of painful boils or lumps under the skin that can occasionally burst. Usually, it affects the groin and underarm regions. According to the Hidradenitis Suppurativa Foundation, between one and two percent of Americans have HS, with African American and mixed … Continue reading Experts explain the causes and treatments of hidradenitis suppurativa, a persistent skin ailment.