Skincare Myths That Refuse to Die — and What the Evidence Actually Says

Pore size is largely determined by genetics and skin type. What cold water or astringent toners can do is temporarily reduce the appearance of pores by causing mild skin contraction or by removing surface oil that makes pores look larger. Long-term, keeping pores clear of debris with gentle cleansing and appropriate exfoliation has a more meaningful effect on how visible they look. No topical product can permanently alter pore size. You can read more about personal grooming basics for related guidance.

Staying well-hydrated is genuinely good for your body — but the skin's hydration level is primarily managed by its outermost barrier layer, not by how much water you drink. Severely dehydrated individuals may see improved skin texture when they rehydrate, but for someone already drinking adequate amounts, adding more water won't produce dramatic skin changes. Topical humectants like hyaluronic acid and occlusives like ceramide-containing moisturizers are far more direct tools for surface-level hydration.

Poison ivy is natural. So is poison oak. Meanwhile, many well-studied synthetic ingredients, like niacinamide or certain preservatives, have robust safety profiles and are precisely formulated for consistency. Some botanical extracts are among the most common causes of contact dermatitis. When evaluating any skincare product, what matters is the specific ingredient, its concentration, and how your individual skin responds — not whether it came from a lab or a plant.

SPF ratings are established under test conditions where a specific amount of product is applied per square centimeter of skin. In practice, most people apply far less foundation than that — meaning the real-world protection is a fraction of what's printed on the label. A dedicated sunscreen applied as a distinct step is the standard dermatologists recommend. For a deeper look at why daily sun protection matters so much, see our article on why dermatologists treat sunscreen as non-negotiable.

Sebum (your skin's natural oil) and water-based moisture are different things. Oily skin produces excess sebum, but that doesn't mean the skin barrier is well-hydrated. Skipping moisturizer — especially after a stripping cleanser — can actually trigger the skin to compensate by producing even more oil. Lightweight, non-comedogenic (meaning formulated not to block pores) gel moisturizers work well for oily skin types without adding grease or heaviness.

UVB rays — the ones responsible for sunburn — are indeed stronger in summer and at midday. But UVA rays, which penetrate more deeply into the skin and are linked to photoaging and skin damage, are present at relatively consistent levels throughout the year and can pass through window glass. This is why a daily sunscreen habit, regardless of season or whether you're driving to work, is considered a foundational step in skin health by most dermatologists.