My daughter is 4 years old. We recently went to the beach for 2 weeks. We used plently of sunscreen and she is mixed so she doesn't burn. However, since returning, we noticed a spot about the size of a dime on the very top of her ear (on the outside fold portion). It looks purplish but it doesn't seem to be sore to the touch. It isn't shaped like a mole, but has the irregular shape of a bruise. Any ideas on what this could be.