I don't think it's a birthmark because I am pretty sure it has not always been there. But I have noticed it has been there for months now. It is about the size of a dime, and only seems to be a weirdly shaped spot with darker skin then the rest of my thigh. It does not burn or itch or feel any different. It kind of looks like a bruise. The area around it is a little red as I tried to shave the area quickly to get a clearer picture.
(see attached pic, others here [though they all look the same]: http://tinypic.com/r/w9xppu/5 http://tinypic.com/r/mwskyr/5 http://tinypic.com/r/mwskyr/5 http://tinypic.com/r/25jyqop/5)
Is the spot anything I should be worried about?