Scabies is not skin disease. Little bugs that crawl under your skin and lay eggs. Get red bumps. Go to regular doctor, they will give you cream and instructions on what to do to get rid of them. Get ready for a experience. When you put on cream... you fill these microscopic bugs crawl and run under your skin. Speaking from experience. They can also be passed on, so take care of it as soon as possible.
A dermatologist is a medical doctor who specializes in the skin and the diseases of the skin. As such, I would think a person who is infected with scabies ought to see a dermatologist, although a general practitioner would also be able to treat the disease.