Waiting times information is also used locally in the. management of elective surgery. National data on elective surgery waiting times includes data on the clinical urgency of the. patient, that is, on how quickly the patient should have surgery.
These areas of skin have the most oil (sebaceous) glands. Acne occurs when hair follicles become plugged with oil and dead skin cells. Hair follicles are connected to oil glands. These glands secrete an oily substance (sebum) to lubricate your hair and skin.
The American Academy of Dermatology (AAD) states that there are 3 causes of acne: 1  Overproduction of oil by enlarged oil glands in the skin. 2  Blockage of the hair follicles that release oil. 3  Growth of bacteria, called P. acnes, within the hair follicles.