Sun Protection Is Healthcare, Not Just Skincare

Sunscreen sits in the skincare aisle, marketed between moisturisers and serums, priced and positioned as a finishing step. That placement has quietly shaped how most people think about it, optional on cloudy days, skippable indoors, useful mainly for avoiding a tan. The clinical picture is different, and the gap between the two is where real harm accumulates.



Ultraviolet radiation reaches skin in two forms. UVB, the shorter wavelength, acts directly on DNA in the epidermal cells, it causes pyrimidine dimers, which are structural errors in the DNA strand that the cell's repair machinery has to correct. When those errors accumulate faster than repair can keep up, or when repair mechanisms are already impaired, the risk of malignant change rises. UVA, the longer wavelength, penetrates deeper into the dermis and generates reactive oxygen species that damage cell membranes, collagen fibres, and DNA indirectly. Both wavelengths are present year-round, and UVA passes through glass. Sitting near a window for several hours a day is not a UV-free environment.

India sits between roughly 8 and 37 degrees north latitude, which means UV index readings in most metros and tier-1 cities regularly exceed 7 for a significant part of the year, levels the World Health Organization classifies as high to very high. Higher ambient UV is not offset by having more melanin. Melanin does provide some natural photoprotection, but it does not block UV radiation entirely, and it does not prevent the DNA damage that accumulates with repeated unprotected exposure. Darker skin tones tend to present with UV-related damage later and less visibly, which can delay the point at which someone seeks clinical attention, not because the damage is not occurring, but because the early signs are less obvious.

Sun protection becomes particularly consequential for anyone already managing a skin condition. Melasma, one of the most common pigmentation concerns in Indian women, is driven by a combination of hormonal triggers and UV exposure, and UV is the component that is modifiable. Without consistent broad-spectrum protection, any treatment for melasma is working against ongoing provocation. Lupus erythematosus, rosacea, and certain forms of eczema are photosensitive conditions where UV exposure can trigger or worsen flares. Patients on prescription retinoids, certain antibiotics such as doxycycline, and several antifungal medications are also at increased photosensitivity risk, meaning their skin's threshold for UV damage is lower than baseline while they are on treatment. A dermatologist prescribing any of these without discussing sun protection has left the prescription incomplete.

A sunscreen labelled SPF 30 or 50 addresses UVB. Broad-spectrum means it also filters UVA, and this distinction matters clinically. In India, look for sunscreens that carry a PA rating alongside the SPF number, PA++ or higher indicates meaningful UVA protection under the Japanese measurement system, which is widely used on products available in the Indian market. The quantity applied matters as much as the number on the label: SPF ratings are measured at 2 mg per square centimetre of skin, which is roughly a quarter teaspoon for the face and neck. Most people apply considerably less, which means the effective protection is lower than the stated SPF. Reapplication every two hours during outdoor exposure is not a cosmetic recommendation, it reflects the photodegradation of UV filters over time.

Sun protection is relevant for everyone, but the clinical conversation is especially important for people with a personal or family history of skin cancer, those with photosensitive conditions, anyone on long-term medication that increases UV sensitivity, and those who spend extended time outdoors for work rather than leisure, where consistent reapplication is harder to maintain. It is also worth raising with a dermatologist if you have noticed pigmentation changes, new or changing moles, or persistent redness that worsens after sun exposure.

These are not cosmetic concerns to manage with a better SPF; they are reasons for a clinical assessment. The dermatologist's role here is not to recommend a product but to assess your specific risk profile and, where relevant, check for changes that warrant closer attention. Self-monitoring has limits, and some UV-related skin changes are not visible to the untrained eye until they have progressed. The cumulative nature of UV damage is precisely what makes the medical framing important: the harm is not dramatic or immediate, which makes it easy to defer, and deferral is where the risk compounds.

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