Signs and Symptoms
Erythema nodosum usually resolves itself 3–6 weeks after an event, either internal or external to the body, that initiates a hypersensitivity reaction in subcutaneous fat. EN is frequently associated with fever, malaise, and joint pain and inflammation. It presents as tender red nodules on the shins that are smooth and shiny. The nodules may occur anywhere there is fat under the skin, including the thighs, arms, trunk, face, and neck. The nodules are 1–10 cm in diameter, and individual nodules may coalesce to form large areas of hardened skin.
As the nodules age, they become bluish purple, brownish, yellowish, and finally green, similar to the color changes that occur in a resolving bruise. The nodules usually subside over a period of 2–6 weeks without ulceration or scarring.
Dermatophytids are similar skin lesions that result from a fungus infection such as ringworm in another area of the body.
Read more about this topic: Erythema Nodosum
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