One of the most apparent differences between warts and skin tags is their appearance. The surface of the wart seems to be a bit irregular, while the surface of the skin tag is usually smooth. HPV or Human Papillomavirus cause a lot of warts. Skin tags are not associated with this at all. If you know that you have had recent exposure to HPV, you should get yourself checked immediately because this is highly contagious.
Dermatologists will be able to remove both warts and skin tags. There are also some skin tags that you can remove by yourself at home, but warts should usually be removed by professionals to ensure that they can be removed safely.