Hi and welcome to the hepatitis c community.
Do you have hepatitis c? erythema nodosum can be caused bu many conditions.
http://www.medicinenet.com/erythema_nodosum/page2.htm#what_are_the_signs_and_symptoms_of_erythema_nodosum
What causes erythema nodosum?
Erythema nodosum may occur as an isolated condition or in association with other conditions. Conditions that are associated with erythema nodosum include medications (sulfa-related drugs, birth control pills, and estrogens), strep throat, Cat scratch disease, fungal diseases, infectious mononucleosis, sarcoidosis, Behcet's disease, inflammatory bowel diseases (Crohn's disease and ulcerative colitis), and normal pregnancy
How is erythema nodosum treated?
Erythema nodosum is initially managed by identifying and treating any underlying condition present. Simultaneously, treatment is directed toward the inflamed skin from the erythema nodosum.
Treatments for erythema nodosum include anti-inflammatory drugs, and corticosteroids by mouth or local injection. Colchicine is sometimes used to reduce inflammation. Treatment must be customized for the particular patient and conditions present, such as the existence of any associated diseases. It is important to note that erythema nodosum, while annoying and often painful, does not threaten internal organs and the long-term outlook is generally very good.
Are you seeing a doctor for erythema nodosum?
If you don't have hep c you may want to ask about erythema nodosum in the Dermatology Community
http://www.medhelp.org/forums/Dermatology/show/65
Good luck
Lynn