Hi, before 3 weeks i got redness inside my lower lip which is not painful. It became so bright with red blood vessels when i pull it outside in front of light. Gp told me that it can be ulcer and suggest me to gargle with salt water. Now i got multiple tiny blisters on the same red region but not painful. I tried salt water and listerine anseptic mouth wash also. Nothing works. What can it be i am so much worried.