Skin cancer can sometimes look like a pimple that does not heal by 2-3 months like an acne pimple would, and might sometimes bleed more easily or seem to heal and recur over many months. If you are concerned about a bump like this, its best to see a board-certified dermatologist to check it to be sure. They can often tell just by looking, but may sometimes need to perform a painless, thin shave biopsy to double check.