Most sun rashes clear up on their own within 10 days if you stay out of the sun, but you can speed up relief and reduce discomfort with a few straightforward steps. The most common type, called polymorphous light eruption, shows up as itchy red bumps or patches on skin that’s been exposed to sunlight, often in spring or early summer when your skin isn’t yet used to UV rays. What works best depends on the severity: mild cases respond well to home care, while stubborn or widespread rashes may need a topical steroid or other treatment.
Cool the Skin First
The fastest way to get relief is to bring your skin temperature down. A cool (not ice-cold) bath or shower reduces inflammation and takes the edge off the burning, stinging feeling. If the rash covers a smaller area, a damp washcloth or towel placed gently on the skin works just as well. Avoid putting ice packs directly on the rash, which can irritate already-inflamed skin further.
After cooling, apply pure aloe vera gel. Aloe has anti-inflammatory properties that calm stinging and help the skin recover. Use gel straight from an aloe plant or a store-bought version that’s free of added fragrances and dyes, since those can make irritation worse. Reapply a few times a day whenever the itch or heat returns.
Over-the-Counter Treatments That Help
A 1% hydrocortisone cream, available without a prescription, can reduce itching and redness when applied to the affected area two to three times daily. This is a mild topical steroid that’s safe for short-term use on most body areas. For intense itching, an oral antihistamine like cetirizine or diphenhydramine can also help, though diphenhydramine tends to cause drowsiness.
Fragrance-free moisturizers help repair the skin barrier as the rash heals. Look for products containing ceramides or colloidal oatmeal, both of which soothe irritated skin without adding chemicals that could sting. Avoid anything with alcohol, retinol, or exfoliating acids until the rash fully resolves.
Avoid More Sun Exposure
This sounds obvious, but it’s the single most important step. Any additional UV exposure while the rash is active will make it worse and delay healing. Stay indoors during peak sun hours (roughly 10 a.m. to 4 p.m.), and if you need to go outside, cover the affected area with clothing rather than relying on sunscreen alone. Tightly woven fabrics and darker colors block more UV than thin, light-colored materials.
When the rash starts clearing and you gradually return to sun exposure, use a broad-spectrum sunscreen rated SPF 30 or higher. “Broad-spectrum” means the product protects against both UVA and UVB rays. To earn that label, a sunscreen must pass a critical wavelength test at 370 nanometers or above, which ensures meaningful UVA coverage. Apply it generously 15 to 20 minutes before going outside and reapply every two hours.
Check Your Medications
Some common medications make your skin dramatically more sensitive to sunlight, and a “sun rash” may actually be a drug-induced photosensitivity reaction. If you started a new medication before the rash appeared, it’s worth checking whether it’s on this list from the FDA:
- Antibiotics: doxycycline, tetracycline, ciprofloxacin
- Pain relievers: ibuprofen, naproxen, celecoxib
- Blood pressure and heart medications: hydrochlorothiazide, furosemide
- Cholesterol-lowering drugs: simvastatin, atorvastatin, lovastatin
- Oral contraceptives and estrogens
- Acne treatments: isotretinoin and other retinoids
- Diabetes medications: glipizide, glyburide
- Skincare products containing alpha-hydroxy acids (AHAs)
If one of these is the likely cause, the rash will keep returning with sun exposure until the medication is changed or you take strict UV precautions. Talk to whoever prescribed the medication before stopping it, but in the meantime, treat the rash the same way: cool compresses, aloe, and hydrocortisone.
When a Sun Rash Keeps Coming Back
Some people get a sun rash every spring or every time they vacation somewhere sunny. For recurring cases, two strategies can help prevent flare-ups before they start.
The first is gradual UV exposure, sometimes called phototherapy or “hardening.” This is done under medical supervision using controlled UV light in early spring, before natural sun exposure ramps up. The goal is to build your skin’s tolerance slowly. Narrowband UVB and PUVA (a combination of a light-sensitizing agent and UVA light) are the most commonly used approaches for people with severe recurring rashes.
The second is an oral supplement derived from a tropical fern. In clinical trials, taking 240 mg of this extract twice daily for 60 days significantly reduced sunburn episodes and increased the amount of UV needed to cause redness. In one study, subjects taking the supplement were far less likely to experience sunburn compared to placebo (2 versus 8 subjects). In separate trials focused specifically on sun rash, a daily dose of 480 mg starting two weeks before sun exposure significantly reduced skin reactions. The supplement is available over the counter, often labeled as a “sun protection” or “skin defense” formula.
Signs That Need Medical Attention
A typical sun rash is uncomfortable but not dangerous. Rarely, a sun-triggered allergic reaction can cause systemic symptoms that go beyond the skin. Get medical help promptly if your sun rash is accompanied by any of the following: trouble breathing or swallowing, chest pain, fainting or severe light-headedness, vomiting, stomach pain, sudden weakness, or muscle cramps. These can indicate a more serious allergic response, and in the case of solar urticaria (hives triggered by sunlight), anaphylaxis is a rare but real possibility.
You should also see a dermatologist if your rash lasts longer than two weeks, covers large areas of your body, blisters severely, or keeps recurring despite prevention efforts. Persistent cases may need a prescription-strength topical steroid or other targeted treatment that over-the-counter options can’t match.