It is a benign skin growth which can be treated using various natural methods including apple cider vinegar and iodine. But I suggest you let your dermatologist do it to avoid complication and infection.
Please don't wait too long to see a doctor. I may be paranoid, but my husband waited to see a dermatologist and he almost died from cancer.
I am NOT saying you have cancer, but any time you have a change in a mole, beauty mark, etc you should always have it checked.