How Do You Know if You Have a Skin Cancer?

If you see any lump, bump, or skin lesion. that is changing in size, changing in elevation, changing in the rim - those are guide lines to go and get it checked up by a doctor. A friend of mine had a really weird looking mole on the back of his neck. It was just, the border was super weird, and it was really dark. And i said to him, your get that checked out. And he went to the doctor and e it was benign. Now he's angry at me. Do you think that's right? Absolutely not right. Because you can have, yes, you did good. You did good. And tell your friend, is