How Can Parasitic Skin Infection Be Treated?

My sister s best friend has a skin infected parasites that look like worms. She says she cannot get rid of them and she can give them to other people. She will not allow my sister to get close to her. But, she says they are driving her crazy. The worms are a pretty good size and when she pulls them out with tweezers; she can see smaller ones inside the holes that she has just removed one of the worms from. Can you tell me what can be done for her. She needs help bad. Also, would you tell me what these things are called! Just forget I asked. I do not have any money to pay you with!