Repeat the treatment for a few days and you will get the results you expected -- the tag will fall off without any pain. It took 8 days for it to turn black but was still red at the base. To understand color relationships, imagine a color wheel with colors appearing in this order: red, red-orange, orange, yellow-orange, yellow, yellow-green, green, blue-green, blue, blue-violet, violet, red-violet, and back to red. It does sting if you do it with enough force but doing so seems to compromise the skin tag. It was painful doing it this way. Unless a professional assesses the mole, there is no way of knowing whether the cells are cancerous. Ingredients are tested in an FDA regulated environment to abide by the high safety standards. But, this serum actually heals the mark, and contains brightening ingredients to erase any leftover pigment. SkinBiotix MD is a powerful serum made from natural ingredients that work together to safely and painlessly remove moles and skin tags. If you apply it for 20 mins you can see 5-20 small moles gone and if you have larger growth it can work on 2-5 of them. Take an onion and chop it into small cubes.