Since three days I have a red, oval form spot on the left side of my tongue and also a red, sore throat. The spot on my tongue was first smaller, with more red contour, but it is double size now (about 2.5 ), but not sore. I started to eat Activia, since yesterday. I had a strong pain in my teeth at the same side (especially in the evening), where I have an old bridge...I keep my mouth and teeth very clean (three times a day teeth cleaning + waterpik). I never had this before, I don t drink, don t smoke and also had no antibiotics lately.