"It actually interacts with the oil glands themselves to get them to be less active. In a sense, it causes them to 'go to sleep' for up to a year, so oil production is dramatically down," says Crutchfield.
When the glands "wake back up", in anywhere from a few months to a year, additional treatments can put them back to bed in no time.
What you don't want to do is wash your face excessively, trying to get rid of the oil.
"The 'squeaky clean' feeling people get from using soaps is derived from stripping the fatty oils from our skin, and is more harmful than good," says Resnik.
Instead, use a gentle cleanser and wash no more than twice a day.
Teen Skin Problem No. 3: Excess Sweating
Be it on the palms of your hands and soles of your feet, under your arms, in your scalp, or anywhere on your body, if you often find yourself drenched in perspiration, you're not alone. Doctors say this is a major issue for many teens.
The problem, says Resnik, can result from two distinct conditions. The first, he says, is caused by stress - with excess sweating most often occurring under the arms.
"For this situation, all you need is a maximum-strength antiperspirant like Maxim or Certain-Dri, which can really reduce perspiration output," he says.
They work by plugging the sweat ducts so the perspiration never reaches the skin. If over-the-counter antiperspirants don't seem to help, he says, your doctor can prescribe medical- strength products.
When heavy sweating occurs on a regular basis, you may be experiencing what doctors call "hyperhidrosis." This condition is characterized by excessive sweating on the palms, soles, and underarms, and sometimes, the face.
"This can be a terribly isolating condition for a teen -- so much so that many won't it even bring it up their pediatrician or family doctor," says Resnik.
Treatment includes minimally invasive surgical treatments that target the sweat glands, as well as Botox -- the same substance used as a wrinkle treatment. In this case, tiny amounts of the purified botulinum A toxin is injected into sweat glands to block the release of a neurotransmitter or brain chemical called acetycholine, which is linked to sweating.