Hi I've been having a pulsating boil on my lip since a while now. It doesn't affect me much but there are time when I'm stressed that it tends to pulsate a lot and when I relax it tends to not. But the boil is still there with little pulsating sensation that doesn't affect me often. I've had a history of biting and chewing on that part of the lip so I'm quite certain it's because of the trauma to that area. Photo is attached. Please let me know what this could be? I'm am unable to get to a good dentist as my last dentist isn't available.