What is the deal with this come and go bump on my lower lip?

If you has chicken pox then you have like 99% of the population. Proof is that when people get shingles when they are old it is actually the chicken pox again. The virus that causes the chicken pox lays dormant in the spinal chord until the immune system gets weak and then travels up the nerve ending to the skin causing shingles in old age. I'm not saying that this is ,but don't be afraid of it. Now in your diet you might have been eating things higher in arginine than lysine. If you take lysine on an empty stomach 500mgs at a time with vitamiv c 500mgs 1 per day ONLY{Esther-c is the best} the irritation should go away when the amount of lysine surpes the amount of arginine in your system. also be aware of supplements that contain arginine and even some energy drinks. I would look up what foods are high in arginine and avoid those for a while. FYI almost everyone has those things from time to time.Good luck.