Skincare Myths That Dermatologists Keep Correcting

Dry skin happens when the outer layer of skin (the stratum corneum) loses moisture faster than it retains it, often due to environmental factors, genetics, or a compromised skin barrier. While staying adequately hydrated is important for overall health, studies have not established a direct link between increased water intake and improved skin hydration in people who are not clinically dehydrated. What does work: applying a moisturizer to damp skin to lock in moisture, and choosing formulas that contain barrier-supporting ingredients like ceramides, glycerin, or hyaluronic acid.

Pores are not muscles; they cannot open or close in response to temperature. Steam, cold water, and pore-minimizing toners do not alter pore size. What they can do is temporarily affect how pores look. Keeping pores clear of excess oil and debris — through consistent, gentle cleansing and occasional exfoliation — makes them appear less prominent. Retinoids, used consistently over time, may improve skin texture and elasticity in ways that reduce the appearance of larger pores, but even these do not change underlying pore anatomy. You can read more about common related misconceptions in our roundup of personal care myths dermatologists keep debunking.

UVA rays — the type most associated with premature aging and deeper skin damage — penetrate clouds and glass and are present at relatively consistent levels throughout the year, regardless of season or perceived brightness. UVB rays, which cause sunburn, are stronger in summer but are present year-round at varying intensities. Dermatologists widely recommend a broad-spectrum SPF 30 or higher as a daily step regardless of the season or whether you plan to spend time outdoors. This single habit is consistently cited as the most evidence-supported anti-aging measure available.

Poison ivy is natural. So is arsenic. The idea that "natural" equals safe is a marketing concept, not a scientific one. Many well-researched synthetic ingredients — like niacinamide, peptides, or certain sunscreen filters — have strong safety and efficacy profiles. Conversely, some plant-derived ingredients (citrus oils, certain essential oils, fragrant botanicals) are among the most common causes of contact dermatitis and skin sensitization. What matters is how an ingredient behaves on skin, at what concentration, and in what formulation — not its origin.

Exfoliation — whether physical (scrubs) or chemical (acids like AHAs and BHAs) — removes dead skin cells and can improve texture and tone when used appropriately. But skin needs time to complete its natural cell-turnover cycle. Exfoliating too frequently strips away cells that haven't finished their job, weakening the skin barrier. Signs of over-exfoliation include persistent redness, tightness, flakiness, or a sudden increase in breakouts. For most skin types, one to three times per week is a general guideline — but the right frequency varies considerably based on your skin type and the specific product concentration.