1. Lips , tongue , gums and cheeks are on the inside. It is usually superficial or shallow. Round or oval 4. Usually 10 mm. Is smaller than this , but can sometimes be larger than this. 5. Its color is light yellow or white , but it is swollen and red around it. It causes more or less pain , burning when eating. Can be 7-8 together 6. It heals in 5-6 days. 1-4 months in a row can be 10. There are usually no scars or blemishes after healing.