<s>[INST] I have a hardened lump on the inside of my thigh, located within a stretch mark. Very tender but not extremely painful. I am prone to chafing - 10 hour shift days at work on my feet all day. Just healed up an infected chafe boil on my other thigh...but this is a hard mass. Related to chafing? Need to be concerned? [/INST] Hi, Dear,Welcome with your query to Chat Doctor. Studied your query in full depth of its details. Reviewed it in context of your health concerns. Based On the facts, You seem to suffer from-repeat boil with abscess in it-which is causing chafing of the superficial skin. Treatment-You need to Chat Doctor. Check for DM-diabetes by blood sugar test with your doctors advise. This reply would help you to plan further treatment soon with your treating doctors. Best of Luck and early recovery. Welcome any further query in this regard, which would be replied in next session. Good Day!! </s>