question: I thought I may have tennis elbow since I do a lot of yardwork & repetitive motions like pruning. Then, I wondered if it could be a boil. It was painfully swollen all around elbow, but I iced, elevated & rested it. Now, most of the swelling is more centralized to my elbow. It came on rather suddenly. A dull, but sensitive pain on Monday, then I woke with it hurting & swolen. Wednesday & Thursday better, but elbow is more red & I still have swelling.