Skin lotion ingredients are substances used to make skin lotions. Common ingredients include aloe, aloe vera, and petroleum jelly. Aloe is a succulent plant with thick leaves that contain a gel-like substance. Aloe vera is a species of aloe that is widely used in skin care products. Petroleum jelly is a semi-solid mixture of hydrocarbons derived from petroleum. All three of these ingredients are commonly used in skin lotions to help moisturize and protect the skin.