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 main causes of acne include clogged pores, bacteria, excess oil production and dead skin. Other factors, such as hormones, diet, stress and certain medications, such as corticosteroids, androgens, birth control pills and lithium, can also worsen acne.