Skincare Myths That Persist Despite the Science

This is one of the most enduring skincare beliefs, but pores lack the muscular structure needed to open and close. What steam may do is soften the debris and sebum inside a pore, making manual extraction feel easier. Cold water may temporarily reduce the appearance of pores by causing mild skin constriction, but it does not change pore size structurally. Pore size is largely determined by genetics, skin type, and age-related changes in elasticity.

While staying adequately hydrated supports general health, the relationship between water intake and visible skin moisture is more indirect than commonly believed. Severe dehydration can affect skin appearance, but drinking extra water beyond normal intake does not meaningfully improve skin hydration levels in most people. The skin barrier—specifically its lipid structure and natural moisturizing factors—is what controls transepidermal water loss. Addressing dry or dehydrated skin usually requires topical approaches: occlusives, emollients, and humectants applied directly to the skin.

Many potent allergens and irritants are entirely natural—poison ivy, certain essential oils, and fragrant botanicals are well-documented examples. Conversely, many lab-synthesized ingredients are among the most extensively studied and well-tolerated compounds in skincare. The classification of an ingredient as natural or synthetic says nothing about its safety profile. Evaluating ingredients based on published evidence, patch testing, and individual skin response is a more reliable approach than relying on origin as a proxy for quality. See how fragrance in skincare works for different skin types for one relevant example.

Sebum production (oiliness) and the skin's water content are separate processes. Oily skin can be simultaneously dehydrated—meaning it lacks water, not oil. Skipping moisturizer often signals the skin to compensate by producing more sebum. Lightweight, non-comedogenic formulas can support the barrier without contributing to clogging. The goal is to replenish water content and support barrier integrity, not to add more oil.

Exfoliation—whether chemical (AHAs, BHAs) or physical—removes dead skin cells and can improve texture and clarity when used appropriately. But frequency matters enormously. Exfoliating too often strips the skin's protective barrier, disrupts its microbiome, and triggers inflammation. Many people experiencing chronic redness, sensitivity, or unexplained breakouts are over-exfoliating rather than under-exfoliating. The differences between chemical and physical exfoliants also affect how often each can safely be used.

UVB rays, which cause sunburn, are more intense in summer and direct sunlight—but UVA rays, which penetrate more deeply and are associated with photoaging and DNA damage, are present throughout the year and can pass through window glass. Dermatologists broadly recommend daily broad-spectrum sunscreen as part of a morning routine regardless of season or planned outdoor time. Consistent daily use is considered one of the most evidence-supported steps for long-term skin health.