Recurrent palmoplantar hidradenitis (also known as "Idiopathic palmoplantar hidradenitis,"[1] "Idiopathic plantar hidradenitis"[2], "Painful plantar erythema,"[1] "Palmoplantar eccrine hidradenitis"[1], "Plantar panniculitis"[1]) is primarily a disorder of healthy children and young adults, characterized by lesions that are primarily painful, subcutaneous nodules on the plantar surface, resembling erythema nodosum.[2]:780