Erythema nodosum

[Jessica]

Erythema nodosum is a form of panniculitis (inflammation of the fat layer beneath the skin) that produces tender red or violet bumps (nodules) under the skin, most often over the shins but occasionally on the arms and other areas.

Erythema nodosum usually is caused by a reaction to a drug, an infection (bacterial, fungal, or viral), or another disorder such as inflammatory bowel disease.
Typical symptoms include fever, joint pain, and characteristic painful red bumps and bruises on the person