Hello, I noticed one day at work as I was drinking some water that I have a swollen bump on my upper lip. If it stays untouched it will go away but if I play around with it like pinching it the swelling of the bump will get bigger. But will eventually always go away within the hours. There s no pain or itching or burning. It came back today which is 2 days later from the first incident. What could it be? Ps I have never had a cold sore and no possible way of contracting it.