Skincare Myths That Dermatologists Frequently Correct

Poison ivy is natural. So is the urushiol that causes its rash. The word "natural" on a label is a marketing descriptor, not a safety certification. Common plant-derived ingredients such as essential oils, citrus extracts, and certain botanicals are among the more frequent causes of contact dermatitis documented in dermatology literature. Synthetic ingredients, by contrast, are often developed specifically to be stable, predictable, and well-tolerated. What matters is the ingredient itself, its concentration, and how your individual skin responds — not whether it came from a plant or a laboratory.

Some active ingredients — such as low-concentration alpha hydroxy acids or vitamin C — may produce a mild, brief sensation on first use. That is different from persistent burning or stinging, which typically indicates that a product is disrupting your skin barrier rather than improving it. Equating discomfort with effectiveness can lead people to tolerate products that are actively causing harm. If something consistently stings, that is a reason to stop using it and reassess, not a sign to push through.

Sebum (oil) and water content are two separate things. Skin can be both oily and dehydrated at the same time — a state sometimes called combination-dehydrated skin. When moisture is stripped away by harsh cleansers or left unreplenished, the skin may increase sebum output to try to compensate. Using a lightweight, non-comedogenic moisturizer helps maintain the skin's water balance without adding a heavy feel. The goal is to select a formulation appropriate for oily skin, not to skip hydration entirely. Our article on why your moisturizer might not be hydrating your skin covers formulation mismatches in detail.

UV exposure is cumulative. The brief minutes of daily incidental exposure — walking to your car, sitting near a window — add up over years and contribute meaningfully to photoaging and skin cancer risk. Dermatological organizations consistently recommend broad-spectrum SPF 30 or higher as part of a daily routine regardless of weather or planned outdoor time. For a more detailed look at why daily SPF matters, see our article on sunscreen every day.

The idea that pores behave like doors — swinging open with heat and snapping shut with cold — is anatomically inaccurate. Pores are follicular openings in the skin; they have no mechanism for dilation or constriction. What steam can do is soften the debris inside a clogged pore, making manual extraction easier. What cold water can do is temporarily reduce redness or puffiness. Neither changes actual pore diameter. Perceived pore size is influenced by genetics, skin tone, sebum production, and sun damage — not rinse water temperature.

Exfoliation — whether physical scrubs or chemical acids — accelerates the removal of dead skin cells. Used appropriately, it can improve texture and allow other products to penetrate better. Used too often, it removes cells faster than the skin can replace them, compromising the barrier and triggering inflammation. Frequency depends on the exfoliant type and your skin's tolerance, but most people find that two to three times per week is the upper limit before diminishing returns set in. For a full breakdown of what over-exfoliation does to skin, our article on why exfoliating too often makes your skin worse is a useful resource.