skin disorders
Erythema Nodosum
Diagnosis of Erythema Nodosum
A doctor's evaluation Sometimes a biopsy The painful nodules are usually the telltale sign for the doctor. Sometimes a nodule is removed and analyzed with a microscope (biopsy) to confirm the diagnosis. Other testing is done to look for possible causes and can include a chest x-ray, blood tests, and skin testing for tuberculosis. 