Alongside the funky mole, there are 5 signs of skin cancer that often shows. They are Asymmetry, Border, Color, Diameter and Evolve/Elevation. and easiest way to distinguish is the color, skin cancer growths are frequently multicolored in appearance, and may be black, white, brown, red, or blue. however, moles can also have a bluish tint to them. this signals melanoma.
one type almost looks like a scab, brown or black in color and at times can itch and)or get flaky. another type looks the same as skin does, almost like a skin tag. Raised and firm kinda like a bug bite looks like. these can also get itchy but don't discolor or get flaky. Both of these types are of the safer variety and don't normally cause other issues. those are the only 2 that I have knowledge about. there are other types from what I understand also.
Not really in the early stages…as the cancer spreads you would be experience more harsh symptoms.
But often the moles will bleed, and there could be some pain the area.