<s>[INST] I have a 2.5x2cm painful lump under the skin on my right inner forearm between the wrist and elbow.  There is no redness or warmth, just very painful to touch. When I flex my wrist it makes the area around the lump tight and that also causes me pain.  Any ideas please? [/INST] Hi.Thanks for your query.The possible reasons can be a intermuscular lipoma, sebaceous cyst or some mass. Get this removed from the Surgeon for two reasons 1. You get rid of the disease as this is causing you discomfort and pain . 2. you get a definitive diagnosis as to what the problem may be . </s>