For the past nine weeks or so, I have had to put up with an unconventional injury I acquired whilst lifting. It's not the conventional injury you'd associate with lifting, which would typically be some sort of strain, torn ligament or muscle. This is in fact oral and was the result of biting my lip! Typically, you'd get an ulcer, it would heal and that would be that. But in my case, it healed but then came back and persisted as such, repeatedly healing and coming back. I have now since been to a consultant who specialises in such things and has diagnosed it as a Mucocele. Typically these things will heal themselves, but when they have persisted beyond three weeks or so, surgery is inevitably required to remove the gland.
Here is an article on Mucoceles: http://emedicine.medscape.com/article/1076717-overview
Hopefully I will get an appointment to have the faulty gland removed and that will be that. There are some risks associated with the removal, but really, I am not that worried given how annoying this thing is and how painful it gets when swollen. My advice is to avoid biting your lip when you lift and of course when eating. If you are struggling not to, it might be worth investing in a mouth guard and wearing it to stop you from lip biting.
Might I add that this is generally only an issue when lifting heavy, since it's the strain associated with lifting heavy that can make you do irrational things, such as biting your lip!
If all that wasn't enough to put you off your tea, here is a photo of my Mucocele.