I Have A Small Indentation On The Right Of My

I have a small indentation on the right of my skull at my hairline above my right eye. Never had any accident or pain. About 1 inch in length. I do forget things kind of sometimes. More often than I think I should.... Not sure if that's related or just genetic. I am 19 and it's been there for a few years and just randomly appeared one day.. figured it would just go away because I'm not done growing but it hasn't. Any ideas what this may be?