Oh, the sun. It sucks for your body in so many ways. Here's another one: The sun makes marks left from pimples worse by increasing the level of pigmentation in skin, so they take much longer to fade. (Grumble, grumble.)

Your Rx: Never go outside without broad-spectrum sunscreen. "The best ones to look for are zinc [oxide] or titanium [dioxide] sunblocks that have a tint, so they protect and cover at the same time," Tanzi says.

Tanzi likes the "light and noncomedogenic" L'Oréal Advanced Suncare Silky Sheer BB Face Lotion 50+ and La Roche-Posay Anthelios 50 Mineral Tinted Ultra Light Sunscreen Fluid.

Vitamin E is in avocados, papaya, olive oil and so many other magnificent things. But the very ingredient that makes you look hydrated and glow-y is hell on acne.

Researchers at the University of Miami found that vitamin E inhibits scar healing for 90 percent of patients (yowza). In the study, vitamin E caused contact dermatitis in one third of these patients.

Your Rx: Steer clear of products that boast vitamin E on their ingredient labels. (You might see it referred to as alpha-tocopherol.) Taking it orally in supplement form is A-OK.

Some of the most bacteria-laden objects in your environment are the ones that receive the most contact with your hands. In fact, your cellphone is one of the most pathogen-infested things you touch on a daily basis, notorious among dermatologists for its bacteria-transferring abilities.

"The area from the temple to the chin [is] referred to as the 'phone zone,'" says Frank. "Your phone holds onto germs and these germs can be transferred onto your skin."

Your Rx: Keep a box of antibacterial wipes in your desk or car caddy so you remember to wipe down your device a few times a week. Frank recommends regular exfoliation to unclog pores and lessen the likelihood that bacteria transferred from your phone will lead to a breakout.

Deep, "icepick" acne scars -- the ones that look like little crevices in the skin -- are some of the most difficult to treat. One of the most powerful solutions: Get rid of the skin altogether.

"In punch excision surgery, deep scars are treated using a punch biopsy tool," explains Peredo. Essentially, the dermatologist punches a hole in the skin just large enough to remove the affected skin. "Then, skin can either be sutured together or grafted with skin from behind the ear," says Peredo.

Your Rx: If you have mild to moderate icepick scarring, ask your dermatologist if you're a candidate for excision. Another option: Have your doctor inject the scar with fillers like Juvederm. The results are more temporary than punch excision, but they're immediate and the process is less invasive.

If you've tried a billion approaches to curing your adult acne with no success, consider what your gut may be telling you. In a recent study, patients with acne and rosacea produced less sebum and had fewer pimples after 12 weeks of drinking a Lactobacillus probiotic supplement.

Using probiotics, the so-called good bacteria, to fight skin issues is nothing new, says Goldfaden. "Topical use of probiotics or yogurt has been around for thousands of years," he explains. "Yogurt and probiotics are calming for redness and irritation and antimicrobial.... Trying it out cannot hurt."

Your Rx: Try probiotic-based skin-care products like Bliss No Zit Sherlock Acne Kit. Also look for probiotic supplements containing the strains Lactobacillus and Bifidobacterium and eat foods with live active cultures (like kefir, miso, kombucha and kimchi).