There are several skin lesions that are very common and benign (non-cancerous). These conditions include moles, freckles, skin tags, benign lentigines, and seborrheic keratoses.
If you notice changes in a mole's color, height, size, or shape, you should seek for a proper medical consultation. You also should have moles checked if they bleed, ooze, itch, or become tender or painful.