warts are caused by viruses and can spread to adjacent skin and multiply rapidly. it can be transferred from person to person by sharing towels, pillows etc.. moles are nothing but nevi and people who have genetic prediction are likely to get it.size of mole can gradually increase skin tags are benign extra growth of skin . and are commonly seen in obese persons. all the 3 types of conditions are benign but can be cosmetically disfiguring..they can be easily removed with a radio frequency machine... procedure is simple and quick.