Last week I played pretty hard gigs Mon-Thurs night. Lips felt fine Friday but decided to take a day off. Friday night I start feeling a blister swelling up right around where red lip tissue meets normal skin on lower lip. I would wake up throughout the night and could feel it getting bigger and bigger, by Friday morning it was pretty big and over the next 24 hours or so, three little red smaller blisters showed up on it. This definitely isn't a blister from too much playing right? Seems like those usually show up immediately after playing, and not delayed like this one. I had to lay off for 4 days and then last night was a big benefit I had to play. It hurt and the fact that it was already swollen def didn't help since I just switched to a Parduba, YIKES!! So, I have gigs tonight, Thurs, and Friday. I guess my biggest concern is if I can do any permanent damage by playing on it as it still has not completely healed? Thanks for the help guys!!