What Does Aftersun Do? | Cooling Relief After Sun Exposure

Aftersun cools, moisturizes, and soothes skin that feels hot, tight, or irritated after sun exposure.

Getting too much sun leaves skin hot, tight, and uncomfortable — sometimes for days. Aftersun is the product made for exactly that moment: it cools the skin and restores moisture to help it recover. It is not a sunscreen and offers no protection from UV rays, so it works after the damage is done, not before. Here’s what it actually does, how to use it properly, and the mistakes that make sunburn worse.

How Aftersun Relieves Sunburnt Skin

Aftersun works through two simple actions: cooling and moisturizing. The cooling sensation comes from ingredients like aloe vera or menthol, which soothe the stinging heat of a fresh burn. The moisturizing base helps rehydrate skin that has been dried out by sun exposure, easing the tight, stretched feeling that makes sunburn so uncomfortable.

The NHS, which recommends aftersun cream or spray as the first step in sunburn care, describes its role as relieving symptoms while the skin heals. Some aftersun products go a step further. One widely available OTC gel combines aloe vera with lidocaine 5 mg per 1 g — a topical anesthetic that numbs the nerve endings in irritated skin, providing measurable pain relief rather than just a cooling sensation. All of these products treat the symptoms of a burn; none of them speeds up healing or prevents the underlying UV damage.

How To Use Aftersun The Right Way

For aftersun to work, it needs to go on properly prepared skin. The NHS’s recommended sequence for treating a mild sunburn is straightforward:

• Get out of the sun immediately and stay out while the burn is active.
• Cool the skin with a cool shower, bath, or a damp towel — let the skin air dry rather than rubbing it.
• Apply a generous layer of aftersun or an unperfumed moisturizer to the affected areas.
• Drink extra water to counter dehydration from sun exposure.
• Take paracetamol or ibuprofen if the burn is painful.

Reapply the aftersun whenever the skin starts to feel hot or tight again. For a lidocaine-containing product, follow the label’s dosing directions — it’s a topical drug, not a plain moisturizer, and it shouldn’t be used more often than the OTC instructions allow. If the burn is severe enough that blisters form, or if you experience nausea, chills, fever, dizziness, or weakness, the NHS advises seeking medical attention rather than continuing home care.

What Not To Do On A Sunburn

Sunburn care is as much about avoiding the wrong moves as applying the right ones. The NHS is explicit about the products and habits that make a burn worse:

• Skip petroleum jelly and heavy oils. These trap heat in the skin and can make the burn feel worse. Stick to water-based aftersun lotions or gels.
• Never use ice or ice packs. The intense cold damages already-stressed skin tissue.
• Don’t pop blisters. They’re the body’s natural dressing; breaking them opens the door to infection.
• Don’t scratch peeling skin. Peel gently off or leave it alone entirely.
• Avoid tight clothing. Loose, soft fabrics prevent friction against tender skin.

When Aftersun Is Not The Answer

Aftersun is designed for everyday mild burns — the kind that leaves skin pink, warm, and tight but otherwise intact. It is not equipped for a serious burn. The NHS guidance is clear that blistered skin or systemic symptoms like fever, chills, nausea, or dizziness mean the burn has moved beyond what home care can handle, and medical advice is needed. Aftersun also offers zero protection against future exposure; it treats the symptom, while prevention requires sunscreen applied before you go out.

If you’re looking for a product to keep on hand for those inevitable summer over-exposures, our roundup of the best aftersun creams breaks down the top-rated options by ingredients and skin type. For the burn you already have, the fundamentals matter more than the brand: cool the skin, moisturize generously, and give it time.