yes. get it checked out medically. there is really no way to determine the significance of a lump based solely on a description.
the is a dark mark and lump on my arm that not a bruise. its sort of oval shaped in my armpit area on the backside of my arm. its been there for months(at least 3) now. this skin over the lump is darker than the skin surrounding it & smooth. idk what to say about the borders because theres really no def border. it just looks like a smear of darker color and its not itchy/flaky or anything. the lump is really firm& isnt malleable i can’t move it at all& theres been no pain from it. i just need to know if it sounds like something i should get checked out.