Quick answer: To treat sunburn blisters safely, cool the skin with cool (not cold) compresses, leave blisters intact, apply a gentle fragrance-free moisturizer or pure aloe, stay hydrated, and use over-the-counter pain relief according to the label. Do not pop blisters, peel skin, or apply butter or oils. Blistering means a second-degree burn, so watch for the warning signs below that call for medical care.
Understanding how to treat sunburn blisters properly is important because blistering sunburns are a second-degree burn that, if mismanaged, can lead to infection, scarring, and increased long-term skin cancer risk. Knowing how to treat sunburn blisters the right way means resisting common instincts like popping blisters and instead following evidence-based care that promotes safe healing.
Sunburn blisters develop when ultraviolet (UV) radiation damages the skin deeply enough to affect the dermis, the second layer of skin. The body responds by forming fluid-filled blisters to protect the damaged tissue underneath. Dermatology and public-health sources, including the American Academy of Dermatology and the Skin Cancer Foundation, note that a history of blistering sunburns, especially in childhood and adolescence, is associated with a substantially higher lifetime risk of melanoma, which makes both proper treatment and future prevention essential.
This guide covers safe home treatments, pain management, when blisters signal a more serious condition, and steps to prevent future blistering sunburns. If your symptoms go beyond blisters, you may be dealing with sun poisoning, which requires different care. For more health information, visit our medical conditions guide.
Seek urgent or emergency medical care if a sunburn involves any of these warning signs:
- Blistering that is large or widespread (covering a big portion of the body)
- Fever, chills, or shaking
- Nausea, vomiting, severe headache, confusion, dizziness, or fainting (possible sun poisoning or heat illness)
- Signs of infection: spreading redness or warmth, pus or cloudy drainage, red streaking away from the burn, or worsening pain after the first 48 hours
- Blisters on the face, lips, or around the eyes, or any change in vision
- A blistering sunburn in an infant or young child
When in doubt, call your doctor, an urgent care clinic, or emergency services. Heat-related illness can escalate quickly.
Why Sunburn Blisters Form
Sunburn blisters typically appear 6 to 24 hours after excessive UV exposure and indicate a second-degree sunburn. While a first-degree sunburn causes redness, warmth, and mild pain, a blistering sunburn means the UV damage has penetrated beyond the epidermis into the dermis.
The blisters themselves form as a protective response. The body creates a fluid-filled cushion over the damaged dermis, forming a sterile environment that promotes healing and protects sensitive nerve endings from further irritation. The fluid inside sunburn blisters is primarily composed of serum, the clear portion of blood, and contains proteins and other substances that support tissue repair.
According to the Cleveland Clinic, the severity of sunburn blisters depends on skin type, the intensity and duration of UV exposure, the time of day (UV radiation is strongest between 10 a.m. and 4 p.m.), altitude and proximity to the equator, reflective surfaces such as water, snow, or sand, and whether the person was using any medications that increase photosensitivity. Even on cloudy days, up to 80 percent of UV rays can reach the skin, so blistering burns are not limited to bright, sunny afternoons.
Step-by-Step Treatment
Treating sunburn blisters properly requires patience and gentle care. Follow these steps for optimal healing.
Cool the Skin
As soon as you notice blistering, gently cool the affected area. Take a cool (not cold) bath or shower, or apply cool, damp cloths to the blistered areas for 10 to 15 minutes several times a day. Avoid ice or ice water, which can further damage the already compromised skin. Cool compresses provide immediate pain relief and help reduce inflammation. The Mayo Clinic recommends cool compresses as a first-line home treatment for sunburn, and gently patting the skin dry rather than rubbing it.
Do Not Pop the Blisters
This is the most important rule in treating sunburn blisters. Intact blisters provide a natural sterile bandage over the damaged skin. Popping blisters removes this protection, exposes raw skin to bacteria, significantly increases infection risk, slows healing, and can lead to scarring. If a blister breaks on its own, gently clean the area with mild soap and water, apply a thin layer of a plain antibiotic ointment, and cover with a non-stick sterile bandage. Avoid products that contain fragrances or numbing ingredients, which can irritate broken skin.
Moisturize Gently
Once the skin has cooled, apply a gentle, fragrance-free moisturizer or aloe vera gel to the affected areas. Aloe vera has been studied for burn care and is widely recommended for its soothing, moisturizing properties. Choose pure aloe vera gel without added fragrances, alcohol, or dyes, as these additives can irritate damaged skin. Other soothing options include products containing soy, oat extract, or hyaluronic acid. Avoid petroleum-based products and thick ointments on fresh, still-hot sunburn, as they can trap heat before the skin has fully cooled.
Manage Pain and Inflammation
Over-the-counter pain relievers can help manage the discomfort of a blistering sunburn. Nonsteroidal anti-inflammatory drugs such as ibuprofen (Advil, Motrin) can ease pain and inflammation, and acetaminophen (Tylenol) is an alternative for pain relief. Follow the dosing directions on the product label, and check with a pharmacist or clinician before use if you are pregnant, take other medications, or have kidney, stomach, liver, or heart conditions. Do not give aspirin to children or teenagers. Starting pain relief early, rather than waiting for pain to become severe, tends to be more effective.
Stay Hydrated
Sunburns draw fluid toward the skin surface and away from the rest of the body, increasing the risk of dehydration. Drink plenty of water and electrolyte-containing beverages. Signs of dehydration to watch for include dark urine, dry mouth, dizziness, headache, and fatigue. According to the CDC, maintaining adequate hydration supports the healing process and helps the body manage the inflammatory response to UV damage. Rest in a cool, shaded, or air-conditioned environment while you recover.
What to Avoid
Several common practices can worsen sunburn blisters or delay healing. Avoid these mistakes.
Do not apply butter, coconut oil, or cooking oils to blistered skin. These trap heat and can promote bacterial growth. Do not use products containing benzocaine or lidocaine, which can cause allergic reactions on damaged skin. Avoid further sun exposure until the blisters have completely healed. Even brief sun exposure on blistered skin can cause additional damage and prolong healing.
Do not peel flaking skin. As sunburn blisters heal, the skin will naturally peel. Allow this process to happen on its own. Pulling or peeling the skin prematurely can tear healthy tissue underneath and increase scarring risk. Do not wear tight clothing over blistered areas. Choose loose, soft, breathable fabrics that do not rub against the blisters. Avoid harsh soaps, exfoliants, and scented lotions on healing skin.
When Sunburn Blisters Signal Something More Serious
In some cases, sunburn blisters may be part of a more serious condition often called sun poisoning (a severe reaction to UV exposure) or may occur alongside heat-related illness. These involve a systemic reaction that goes beyond typical sunburn symptoms. Warning signs include blisters covering a large area of the body, fever, chills and shaking, severe headache, nausea and vomiting, confusion or dizziness, a rapid heartbeat, and signs of dehydration that do not improve with fluid intake.
If you experience any of these symptoms alongside sunburn blisters, seek medical care. Our comprehensive guides on symptoms of sun poisoning and how to treat sun poisoning provide detailed information on recognizing and managing this more serious condition.
You should also contact a clinician if sunburn blisters show signs of infection, including increasing redness and warmth around the blisters, pus or cloudy fluid draining from broken blisters, red streaks extending from the blistered area, increasing pain after the first 48 hours, or swelling that worsens rather than improves. Blisters on the face or near the eyes, and any blistering sunburn in an infant or young child, warrant prompt medical evaluation.
Recovery Timeline
Understanding the typical healing timeline helps you gauge whether your recovery is on track.
During the first 24 to 48 hours, blisters may continue to form and expand. Pain and redness typically peak during this period. By days three to five, blisters begin to flatten and may start to drain naturally. Pain begins to decrease. Around days five to seven, the outer layer of blistered skin starts to peel, and new, pink skin becomes visible underneath. At one to two weeks, most blisters have healed. The new skin underneath is sensitive and should be protected from sun exposure. Full skin recovery, including return of normal pigmentation, may take several weeks to months.
According to the Cleveland Clinic, the most important thing during recovery is to protect the new skin that forms under the blisters. This skin is extremely sensitive to UV radiation and can burn very easily. Use broad-spectrum SPF 30 or higher sunscreen on healed areas and cover them with clothing when possible for at least several weeks after the blisters have resolved.
Preventing Future Blistering Sunburns
Once you have experienced a blistering sunburn, taking steps to prevent future occurrences is important for both comfort and long-term health. Research summarized by the Skin Cancer Foundation and the American Academy of Dermatology has linked a history of blistering sunburns, particularly five or more during adolescence and young adulthood, with a meaningfully increased risk of both melanoma and non-melanoma skin cancers later in life. Even a single blistering sunburn can add to that cumulative risk.
Apply broad-spectrum sunscreen with SPF 30 or higher at least 15 to 30 minutes before sun exposure and reapply every two hours and after swimming or sweating. Seek shade during peak UV hours (10 a.m. to 4 p.m.). Wear protective clothing including a wide-brimmed hat, UV-blocking sunglasses, and long sleeves or UPF-rated garments when practical. Be aware that certain medications increase sun sensitivity, including some antibiotics, diuretics, anti-inflammatory drugs, retinoids, and acne medications. Check medication labels and ask your pharmacist about photosensitivity risks. Never use tanning beds, which deliver concentrated UV radiation.
Frequently Asked Questions
How long do sunburn blisters take to heal?
Most sunburn blisters heal within one to two weeks with proper care. The blisters themselves typically flatten and begin to peel within five to seven days. The new skin underneath may remain pink and sensitive for several additional weeks. Healing time can be longer if blisters become infected or if the burn is particularly severe. Following proper treatment, including not popping blisters and keeping the area clean, promotes the fastest healing.
Should I cover sunburn blisters or leave them open?
If blisters are intact and in an area protected by clothing, they can be left uncovered. If blisters are in an area prone to friction from clothing or are at risk of breaking, loosely cover them with a non-stick sterile bandage. If a blister has broken, always cover it with a clean, non-stick dressing after applying a plain antibiotic ointment. Change dressings daily or whenever they become wet or dirty.
Can sunburn blisters leave scars?
Sunburn blisters can potentially leave scars, particularly if blisters are popped, picked at, or become infected. Superficial blistering sunburns that are properly treated usually heal without permanent scarring, though temporary changes in skin pigmentation are common. Deeper or more extensive blistering may cause lasting marks. Protecting healing skin from sun exposure and using gentle moisturizers can help minimize scarring.
Is it normal to feel sick with sunburn blisters?
Mild systemic symptoms such as headache, fatigue, and slight nausea can accompany a severe sunburn. However, significant symptoms such as high fever, severe nausea or vomiting, confusion, or chills suggest sun poisoning or heat illness, which requires medical attention. If you feel unwell beyond mild discomfort, move to a cool environment, increase fluid intake, rest, and consult a healthcare provider if symptoms persist or worsen.
When should I go to the doctor for sunburn blisters?
See a doctor if blisters cover a large area of your body, you have a fever, chills, nausea, vomiting, confusion, or dizziness, blisters show signs of infection, you have severe pain not controlled by over-the-counter medication, the blisters involve the face or eyes, or a child or infant has a blistering sunburn. The Mayo Clinic recommends medical evaluation for any sunburn that causes extensive blistering or systemic symptoms.
Heal Safely and Prevent Future Damage
Knowing how to treat sunburn blisters correctly protects your skin during the healing process and reduces the risk of complications. The core principles are simple: cool the skin, leave blisters intact, moisturize gently, manage pain according to the label, stay hydrated, and watch for signs of infection or sun poisoning. Once healed, commit to consistent sun protection to prevent future blistering burns and reduce your lifetime risk of skin cancer.
Medical disclaimer: This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Sunburn severity and individual health needs vary. Always follow product labels and consult a qualified healthcare provider or seek emergency care for severe, widespread, or worsening burns, or if you notice any of the warning signs above.
Sources
- MedlinePlus (U.S. National Library of Medicine) — Sunburn
- Mayo Clinic — Sunburn: Diagnosis & Treatment
- Cleveland Clinic — Sunburn and Sun Blisters
- American Academy of Dermatology (AAD) — How to Treat Sunburn
- Skin Cancer Foundation — Sunburn and Your Skin
- Centers for Disease Control and Prevention (CDC) — Sun Safety and Heat-Related Illness