Hello, I have just noticed a bright blood red patch under my 9 month old babies tongue (well one on either side of his lingual frenum). He is teething and has just got his first tooth with the second one about to cut through the gum. He has recently had a slightly runny nose and mild temperature but doesnt seem to be in pain. He also chewing on a lot of things and may have bumped it. Is this just a teething symptom, could it be a strange bruise, or should i take him to the doctor? thank you.