For as long as I can remember, since I was little (I'm now 29), I get a reoccuring scab on the same place on my scalp yearly when summer starts and I am in the sun more. Sometimes it can be around the size of a nickel other times smaller around the size of a pencil eraser. It can last for a few weeks or a couple months then just kinda fade away again till the next year. I don't really have any loss of har in that area, it is where a natural part is so it's not covered as well. Is this something that I should be worried about and have checked out?