Scabies is a skin infection that is caused by tiny insects (mites) which burrow under your skin, causing a very itchy rash. The scabies rash looks like small blisters surrounded by red patches.
Scabies mites are very tiny, the size of a pinhead so they can be very hard to see. Scabies spreads easily between family members and friends.
It is spread by skin contact, and by sharing clothing and bedding. For this reason, it's more common when you have lots of people living together in close contact.