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Dear Anon,

Thank you for your post!

Erythema Nodosum is an allergic reaction caused by many different factors although the elliptical machine is not known to be one of them.

It is usually caused by:
Infections
Streptococcal infections ( strep throat , tonsillitis, rheumatic fever )
Various viral infections (eg, infectious mononucleosis and hepatitis B )
Tuberculosis
Fungal lung infections (coccidioidomycosis, histoplasmosis )
Psittacosis (parrot fever)
Lymphogranuloma venereum (an uncommon sexually transmitted disease)
Leprosy (Hansen’s disease)
Inflammatory conditions
Ulcerative colitis
Crohn’s disease
Sarcoidosis
Medications
Sulfa drugs
Iodides
Bromides
Birth control pills
Unknown causes

When the erythema erupts, it continues to erupt for about 10 days and usually resolve itself anywhere withing 1-2 months. If you would like more information on Erythema Nodosum, please visit our page, here at EmpowHer: https://www.empowher.com/condition/erythema-nodosum/definition

Good Luck!