I have a rather large, hard mass/lump in the crease of the arm , like the elbow crease. The mass is pretty big, maybe golf ball size. I can not fully extend my arm out, it feels like its pulling/ stretching , its almost like my arm wont extend out it hurta. It now has developed lines or indentions on top, maybe from my arm being closed, but the skin doesnt smooth out its lumped up on top. Its red, and sometimes hot to touch, but majorly painful when aggregated. Like trying to open arm, touching it, etc is painful. If i leave arm half way closed and do not touch its fine. I know something is not right, but I do not have insurance and i do not know what to do. Can you please tell me what this could be??? Anything I can do at home to get rid of it or should I go to the ER or find a doctor??