| The thicker or inner layer of the dermis contains blood vessels, hair follicles, nerve endings, sweat and sebaceous glands. |
| Acne is a disorder of the pilosebaceous unit, which is made up of a hair follicle, sebaceous gland and a hair. |
| Associated with the follicle are sebaceous glands and the arrector pili smooth muscle fiber bundle. |
| Histologically, sebaceous hyperplasia consists of enlarged lobules of mature sebaceous glands with a central dilated duct. |
| Testosterone causes excessive sebum to be secreted from the skin's sebaceous glands. |
| These sebaceous glands normally produce sebum, a substance which moisturizes the skin. |
