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Erythema nodosum (EN) is an inflammatory condition characterized by inflammation of subcutaneous fat tissue, resulting in painful red/blue lumps or nodules that are usually seen symmetrically on both shins, on the thighs, arms, and elsewhere. [1]
Recurrent palmoplantar hidradenitis, also known as idiopathic palmoplantar hidradenitis, idiopathic plantar hidradenitis, painful plantar erythema, palmoplantar eccrine hidradenitis, and 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.
Most commonly, athlete's foot can lead to localised vesicles on hands, bacterial infections to erythema nodosum and herpes simplex virus to erythema multiforme. [2] [3] The diagnosis is frequently made by treating the initial triggering skin problem and observing the improvement in the eczematous rash.
Septal panniculitis is a condition of the subcutaneous fat affecting the layer of adipose tissue that lies between the dermis and underlying fascia, of which there are two forms: acute erythema nodosum and chronic erythema nodosum. [1]: 487–9
Löfgren syndrome includes some of the same symptoms as traditional sarcoidosis, and presents with erythema nodosum (especially of the lower extremities), bilateral arthritis of the ankle joints, and hilar lymphadenopathy. (Note: Other symptoms are classically not present in Löfgren syndrome.)
Erythema nodosum is a form of panniculitis characterised by tender red nodules, 1–10 cm, associated with systemic symptoms including fever, malaise, and joint pain. Nodules may become bluish-purple, yellowing, and green, and subside over a period of 2–6 weeks without ulcerating or scarring.
The most common lesions are erythema nodosum, plaques, maculopapular eruptions, subcutaneous nodules, and lupus pernio. Treatment is not required, since the lesions usually resolve spontaneously in two to four weeks. Although it may be disfiguring, cutaneous sarcoidosis rarely causes major problems. [1]
Chronic erythema nodosum (erythema nodosum migrans, subacute migratory panniculitis of Vilanova and Piñol, subacute nodular migratory panniculitis) Chronic erythema nodosum; Cold panniculitis (popsicle panniculitis) Congenital generalized lipodystrophy (Berardinelli–Seip syndrome) Cytophagic histiocytic panniculitis; Drug-induced lipodystrophy