Stress: Being under stress can boost the production of male hormones called androgens. These hormones, which naturally occur in both men and women, stimulate oil production and can worsen acne. Experts believe that an excessive amount of androgens, a condition called hyperandrogenism, may be a significant cause of late-onset acne in women who didn't have acne as adolescents.
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Ans: When the follicle or pore becomes clogged due to excess oil, bacteria and dead skin cells then the pores swell by causing a break in the follicle wall. If the rupture occurs near the skin’s surface then lesion will be minor and gets healed quickly. Then this infected material extends into the dermis and destroys the healthy skin tissue then it forms scars on the skin.
Acne appears when a pore in our skin clogs. This clog begins with dead skin cells. Normally, dead skin cells rise to surface of the pore, and the body sheds the cells. When the body starts to make lots of sebum (see-bum), oil that keeps our skin from drying out, the dead skin cells can stick together inside the pore. Instead of rising to the surface, the cells become trapped inside the pore.
All three dermatologists suggested that the best solution for boxcar or rolling scars are in-office procedures. Dr. Day, for instance, suggestedEndyMed Intensif, which uses microneedle radio frequency to remodel the skin by delivering heat into the skin to stimulate collagen and elastin production. For at-home treatments, however, Dr. Day turns to Olay's DIY microdermabrasion kit. It comes with both a foam head and crystal polisher, which claims to exfoliate 7 times better than a typical scrub and thoroughly cleanses the face to prevent future breakouts.
12. Step away from your hands. You know how you rest your face on your hand while you're studying? That might be the reason for those blemishes on your cheek or jaw. You're constantly touching things that have germs—anything from your phone to your locker—so putting your hands on your face for a long period of time can cause dirt and bacteria from anything you touch to get into your pores.
"You want to calm the inflammation right away," Chiu says of treating newly popped pimples prone to scarring. She suggested asking your dermatologist to prescribe an anti-inflammatory acne medication like Aczone Gel. For a prescription-free solution, dermatologist Ronald Moy suggests treating newer scars with a product containing innovative growth factors that "stimulate collagen production immediately" and "should prevent any new scars from becoming old scars." This serum from Moy's product line, DNA EGF, uses growth factors clinically proven to speed up the growth of healthy skin cells. Both hyperpigmentation (not true scarring, but the spotty aftermath of a breakout) and atrophic scars (those crater marks more deep and sunken) benefit from a stimulating collagen boost because thickening the skin leads to less visibility of existing scars, Moy says.

It's best to consult a primary care physician or dermatologist if an individual is unable to adequately control his or her acne. The goal of treatment should be the prevention of scarring (not a flawless complexion) so that after the condition spontaneously resolves there is no lasting sign of the affliction. Here are some of the options available:
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