Hi my husband is heavy set, he get these large lumps under the skin of his inner upper thigh, groin area like 2 times a month. They are painful and they swell up even larger and get very dark red.. He has tryed to squeeze them and sometimes they burst out, with blood mostly. Why do they keep coming back? He has to cover them with patch bandaids so they won't hurt so bad.They usually take about 4 days to stop hurting and flatten out. Any answers?