It Common warts are local growths in the skin that are caused by human papillomavirus (HPV) infection. They are considered to be contagious,They often affect just one part of the body (such as the hands or the feet).
They can either be warts or an allergy from insect bites. Do they itch? if they do it can be from an insect bite or a fungal infection. Warts on hands dont itch, so it might be warts that you have depending how long you have had it.