Let me add to this, have a loved one check you out once a month chances are you can't see your back or the top of your head. If something looks "funny" go get it checked out -funny means discolored and not symmetrical. The only reason mine was caught was because my wife was concerned about a mole on my back -turns out the mole was nothing but the exam resulted in having about 20 different moles removed including one that was cancerous -everything is cool but I was lucky. Now I get to go to the derm every 3 month for the next couple of years. Use sunscreen!