Contrary to myth, acne is not caused by:

• Greasy foods
  
• Chocolate
  
• Frustrated sex drive

Acne results from a normal increase in levels of the hormone androgen during adolescence--an increase that prompts the sebaceous glands to produce oils. Surface oil doesn't cause acne, though. The culprit is oil in the ducts below the skin surface. When oil ducts in hair follicles become clogged, bacteria on the skin surface can mix with excess oil and cause acne bumps and blemishes. (Acne that reappears later in life is often a milder version of teenage acne.)

Factors that can contribute to acne include:

• Changes in hormone levels preceding a woman's menstrual period or during pregnancy.
  
• Rich moisturizing lotions or heavy or greasy makeup.
  
• Emotional stress.
  
• Foods containing high levels of iodine, such as kelp, beef liver, broccoli, asparagus, and
  white onions.
  
• Nutritional supplements containing iodine.
  
• Exposure to airborne particles from cooking oils, tar, or creosote (often used as a wood
  preservative).
  
• Putting pressure on the face by sleeping on one side of the face or resting your head in your hands.
  
• Taking drugs such as birth control pills, systemic steroids, anticonvulsive medications, and lithium (used to treat some forms of depression).
• Time is the only real cure for acne, but you can try various ways to minimize blemishes and pimples.
• Keep the skin clean by washing several times a day with ordinary soap and water. Using a washcloth, gently massage soap lather into the skin for a minute or two. Rinse well. (Astringents, degreasing pads, and granular face scrubs may also be beneficial.)
  
• Use a fresh washcloth every day. (Bacteria thrive in a damp washcloth, reinfecting your pores if you use it again.)
  
• Ask your dermatologist to recommend a special soap formulated to help acne.
  
• Don't squeeze, scratch, or poke at pimples, This can cause infection or scarring (or both).
  
• Use an over-the-counter acne-drying medication containing benzoyl peroxide. Follow the manufacturer's directions. (Note: Some people are allergic to benzoyl peroxide, so you should test it first by applying a small amount to your hand.)
  
• Wash well immediately after strenuous exercise, to clear away sweat and pore-clogging chemicals.
  
• Shampoo your hair at least twice a week to eliminate buildup of oils that can contribute to acne on your forehead, neck, and shoulders.
  
• Keep hair off your face to keep it free of scalp oil.
  
• If you're a man, soften your beard with a warm towel before shaving, to lessen skin irritation. Shave along the natural grain of the beard, not against it.
  
• Limit time spent in the sun.
  
• Avoid sunlamps.
  
• Avoid greasy or oil-based creams, lotions, and makeups.

Consult a dermatologist if your skin doesn't improve or if you have a severe case of acne.