A biopsy usually involves taking cells or samples from the mole to be analyzed in a lab, according to the Mayo Clinic. Moles are usually just clusters of pigment cells called melanocytes, according to the Cleveland Clinic, but sometimes they can become cancerous. A biopsy helps determine if there is anything wrong with the mole, like melanoma, the deadliest form of skin cancer.
Treat with apple cider vinegar. Get a cotton ball and soak it in apple cider vinegar until it is totally saturated. Place the cotton ball on your skin tag and hold for a few minutes. You can move the ball in a circular motion on the skin to increase absorption if you like. Repeat this process three times per day until your skin tag falls off. This method is usually quite effective. Depending on your skin the vinegar may not be as effective so you can try using apple cider by itself. 
Dysplastic nevi are moles that are generally larger than average (larger than a pencil eraser) and irregular in shape. They tend to have uneven color with dark brown centers and lighter, uneven edges. These nevi are somewhat more likely to become melanoma. In fact, people who have 10 or more dysplastic nevi have a 12 times higher chance of developing melanoma, a serious form of skin cancer. Any changes in a mole should be checked by a dermatologist to evaluate for skin cancer.
Skin tags, medically termed as acrochordons or fibroepithelial polyps (FEP), are just a tiny benign bit of flesh that is typically connected to the underlying skin by a thin stalk. Yeah, gross. On the exterior, they look like minuscule bits of “hanging” skin that are typically taller than wide. These growths are seen in approximately half of all people and can form for a variety of reasons. However, they turn up more often during pregnancy, in diabetics, obese individuals, and those that have a family history of skin tags. They are also more common as you age—and men and women suffer them at about the same rate.
Avoid using mole removal creams. These creams are often sold online, marketed as a cheap, noninvasive alternative to surgical removal. In fact, mole removal creams can end up leaving deep pockets in your skin, since they go beyond the mole and dig into the skin underneath, causing irreparable damage. The small scar left behind by surgical removal is minimal in comparison.