I have a dark patch of skin on my shin that has been there for around 6 weeks, probably more. I thought originally it must have been a bruise, however thought it was strange that I hadn't done anything that would have caused it. I kept an eye on it but it has become slightly more noticeable over time. Obviously I am worried about skin cancer so I was thinking of getting it checked at the Doctor but wasn't sure if I'm being a bit over dramatic seeing as it isn't a mole and doesn't fit the usual criteria. Any thoughts?