types of sebaceous glands
Most sebaceous glands are on the skin and release oil. There are two types of modified sebaceous glands as well. Mammary glands produce milk, and ceruminous glands in the ear canal produce cerumen, or ear wax.
Sebaceous glands are microscopic glands in the skin that secrete an oily secretion known as sebum. They are widely distributed all over the dermis of skin, except for the palms and soles.