Sebaceous glands produce a substance that moisturizes and protects the skin.Because it produces a substance called sebum. The sebum moisturizes the skin and form a protective layer from infections.
<span> attached to hair follicles </span>and<span> release a fatty substance, sebum, into the follicular duct </span>and<span> thence to the surface </span>of<span> the </span><span>skin</span>