Recurrent palmoplantar hidradenitis

Recurrent palmoplantar hidradenitis (also known as "Idiopathic palmoplantar hidradenitis," "Idiopathic plantar hidradenitis", "Painful plantar erythema," "Palmoplantar eccrine hidradenitis", "Plantar panniculitis") 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.

...
Wikipedia