Heidi, both prednisone and coumadin can cause bruising. When I was on a high dose of prednisone my body, and especially my arms, were black an blue all over. My arms were actually scarey to look at. Have you ever noticed that if you go to the doctor's office, or to a lab, many of the senior citizens (folks over 70) have big bruises on their arms? It's often due to coumadin.
I don't know what the pea size lump could be.
I wouldn't worry about the bruises, but I would talk to my rheumy just to be sure.
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