Skincare Myths That Dermatologists Keep Having to Correct

The "open pores" idea is understandable — steam does feel like it should be doing something structural. In reality, pores are static follicular openings. Steam can soften the contents of congested pores, making them easier to clear, but it does not change pore diameter. Similarly, splashing cold water at the end of a cleanse does not physically shrink pores; it may temporarily reduce redness or puffiness. Consistently clean, well-moisturized skin may make pores appear less visible over time, but no temperature treatment alters pore structure.

Poison ivy is natural. So is poison oak. Within skincare specifically, essential oils, citrus extracts, and certain botanicals are among the more frequent triggers of contact dermatitis identified in patch testing. The word "natural" carries no regulated definition in U.S. cosmetic labeling, meaning it functions largely as a marketing descriptor. Synthetic ingredients, meanwhile, are sometimes better tolerated and more stable than their natural counterparts. Evaluate ingredients on their evidence profile and your own skin's history — not their origin story. For more on how labeling language can mislead, our food team's piece on "natural" and "organic" food labels explores the same dynamic in a different category.

Sebum (skin oil) and skin hydration are separate systems. Oily skin produces excess sebum, but it can simultaneously be dehydrated — meaning it lacks water in the upper layers of the epidermis. When this happens, the skin may actually ramp up oil production in a compensatory response. A lightweight, non-comedogenic moisturizer (formulated to avoid blocking pores) can support the skin barrier without contributing to breakouts. Skipping moisturizer entirely, especially after using drying cleansers or active treatments, often makes oily and acne-prone skin harder to manage.

SPF ratings on cosmetics are tested at a specific application weight — roughly 2 mg per square centimeter of skin — which is substantially more product than a typical makeup application. Studies have repeatedly found that people apply foundation and similar products at a fraction of that density. The resulting real-world protection is significantly lower than what the label states. Dermatologists generally recommend applying a dedicated broad-spectrum sunscreen as a separate step before makeup, rather than relying on SPF-labeled cosmetics as your primary protection. Reapplication throughout the day is also important for sustained coverage.

The active ingredients in skincare — retinoids, niacinamide, hyaluronic acid, vitamin C derivatives, and others — are available across a wide price range. What matters is the ingredient's concentration, formulation stability, and how well it suits your skin, not the brand's price tier. Premium packaging, fragrance, and marketing contribute substantially to cost. That said, some formulation differences do exist across price points in areas like texture, elegance, and stability of certain actives. The practical takeaway: focus on the ingredient list and whether a formula suits your skin type rather than assuming a higher price equals higher performance.

Physical exfoliation has a place in many routines, but force is not a useful metric for cleanliness. The skin barrier — a protective layer of lipids and cells — can be compromised by excessive friction, leaving skin more vulnerable to irritation, environmental damage, and bacterial entry. This is especially relevant for people using physical scrubs on active acne, which can spread bacteria and inflame existing breakouts. Gentle, consistent cleansing is generally more supportive of barrier health than vigorous scrubbing. If chemical exfoliation interests you, understanding how AHAs and BHAs work can help you choose an appropriate approach for your skin type.