We all know, the FDA does not regulate cosmetics. It does, however, regulate drugs, i.e.. products containing "actives" that can change the structure of your skin or treat the symptoms of a condition like eczema or rosacea . Those considered a drug by the FDA, means it comes with a specific set of regulatory guidelines and an approval process involving clinical trials before it can be sold. When buying skin care products, how do you know which it is - drug or cosmetic.
For instance, a face wash containing salicylic acid may be considered a drug and list it as an active ingredient if it claims to actually treat or manage acne. If it's a cosmetic, it may just list salicylic acid among its many ingredients.
It's the way a product is marketed—including its intended use, what the consumer perceives it to do, and what the packaging claims it will do—that determines which category the FDA puts it in.
So, a product might say it can "reduce the appearance of" skin concerns such as wrinkles or redness or otherwise make them "less noticeable"—without specifically saying it treats the underlying condition associated with those issues. In these cases, the FDA treats them like cosmetics rather than drugs. Cosmetic ingredients aren't tested by the FDA before they're sold, so the responsibility for them to be safe and effective rests on the manufacturer. Specifically, cosmetics are defined as products "for cleansing, beautifying, promoting attractiveness, or altering the appearance," and they are required not to mislead consumers with their claims, otherwise the FDA may take action.
In 2016, the FDA issued warning letters to 30 different companies for citing drug claims associated with topical skin care, hair care, and eyelash/eyebrow preparations, noted on both product labeling and Web sites. Some examples of the drug claims cited are acne treatment, cellulite reduction, stretch mark reduction, wrinkle removal, dandruff treatment, hair restoration, and eyelash growth. All were selling a product as a cosmetic but labeling and promoting it as a drug, e.g. intended to diagnose, mitigate, treat, or prevent disease, or to affect the structure or function of the body.
Bottom line: be a label and ingredient reader! Be wary of companies claiming to cure a health concern. See if the label states the product is FDA approved. Check with your doctor if you are unsure of the what the product claims.