I have erthema nodosum also. Mine are on my ankles. They started on the right and now I also have on the left. I don't really have pain associated with mine. More tenderness. They are common with Sarcoidosis - which is my current diagnosis - and SLE and some other AI diseases and non AI diseases as well.
For those who are unsure what erythema nodosum are : http://www.nlm.nih.gov/medlineplus/e...cle/000881.htm this is a pretty good description. There is also a pretty good picture on the right of what it looks like.
There doesn't seem to be much to do for this symptom. Most of my doctors overlook it until I point it out and then just seem to make a note in the chart. The worst part, to me at the moment, is I think they just look so darned ugly! At least I can live with ugly. Much better than that brain fog Rob forgot he has!