Hi,Dear,Welcom with your query to HCM.
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 supreficial skin.
You need to drain it to reduce risk of growth in its size, to be done under antibiotic cover from your Surgeon.
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
Senior Surgical Specialist