Hi. Thanks for your query. Noted the history of a lump on the lower part of left arm close to the crease, and couple of smaller ones. there is also burning sensation when you put a little pressure on the lump, stinging type of pain comes on. This is indicative of an infected cyst compressing or pressing on the nerve supplying the lower or distal part. I would advise you the following in such a situation. Get a course of an antibiotic and an anti-inflammatory medication. This should solve your problem. Also consult a General Surgeon so that further clinical consultation can be done to decided whether medical management will help or may need a surgery to get the complete recovery.