"A lot of women use harsh cleansers or wash their face too frequently, leaving their skin blotchy, dry, flaky, or too red," says Dr. Moosbrugger.
If you start to feel like you're sending your skin mixed signals, Dr. Marmur recommends a "skin detox," which requires stopping all chemical enhancers in order to restore your skin's natural tone.
Your skin is just one more area that benefits from a lifestyle that includes a healthy diet, exercise, and avoiding harmful substances.
"You have to remember that skin is an organ like your heart or lungs," says Dr. Prasad.
"Proper hydration, vitamin supplements, getting enough sleep, exercise; these are things that are almost common sense that are often overlooked in skincare. They will give you a healthy foundation so that anything we do on the outside can improve your skin."
However, women may not see the benefits, or consequences, right away.
"In your 20s or 30s, if you took in a lot of sun, or you smoked, or your diet wasn't healthy, if you took in excess alcohol, you really start to pay the price in your 40s and 50s," he says.
One of the most important ways to keep your skin healthy? Don't light up.
"Smoking is one of the worst things you can possibly do to your skin," says Dr. Prasad. "As a surgeon, I can almost always tell if a patient is a smoker when they walk in the door."
It's almost impossible to watch television or read a magazine without seeing advertisements for skincare products. While most ads promise great things, doctors remain skeptical of the benefits of the trendiest or most expensive new product.
"People get seduced by the aggressive marketing of skin products," says Dr. Prasad. "They end up spending a lot of money for products that simply can't deliver."
If we're not to believe everything we see on TV, then what do dermatologists recommend to keep skin looking healthy?
For people with acne, Dr. Marmur suggests a foaming cleanser with salicylic acid to help exfoliate skin.
Once they have outgrown the need for acne-fighting products, many women may want to move on to products that keep their skin looking young.
"The 40s and 50s is when, typically, wrinkles start to bother you, your complexion shows sun damage, and rosacea gets a little worse," says Dr. Marmur.
To protect yourself, experts recommend using a retinol cream at night, as well as occasional chemical peels and exfoliation to rejuvenate the skin.
For younger women looking to start an anti-aging regimen early, protection is your best bet.
"My philosophy is that [in the 20s and 30s] moisturizing your skin and protecting it is your anti-aging regimen," says Dr. Marmur.
"If in doubt, go see your dermatologist," says Dr. Marmur. "If you're starting to feel confused about your skin, you probably are. The earlier the better, if the emphasis is on healthy protection."