The term 'SKIN PRODUCT PREFIX' refers to two words commonly used as prefixes in the names of skin care products. The two words are 'dermo' and 'DERMA, ' both of which have five letters. Dermo is derived from the Greek word for skin, while DERMA is derived from the Greek word for skin or hide. Both words are used to refer to the outer layer of the skin, and are often used in the names of skin care products to indicate that the product is intended to be used on the skin.