Sunburn - Symptoms, Causes & Treatment
By ScanSkinAI Editorial Team✓ Reviewed for medical safetyLast updated June 2026
Red, painful skin that feels hot to the touch, appearing after overexposure to ultraviolet (UV) light from the sun or artificial sources like tanning beds. Severe sunburn can cause blistering and systemic symptoms.
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Quick Answer
Sunburn is a form of acute radiation injury caused by overexposure to ultraviolet (UV) light from the sun or tanning beds. Symptoms typically develop a few hours after exposure, leaving the skin red, warm, tender, and sometimes blistered. While mild sunburns heal on their own within a few days, repeated sunburns significantly increase your lifetime risk of skin cancer, including melanoma. Treatment focuses on soothing the skin with cool compresses, aloe vera, and pain relievers while staying hydrated. Never ignore severe blistering or systemic symptoms like fever.
Clinical Context
Sunburn is an acute inflammatory response to UV radiation, primarily UVB. Damage occurs within minutes but symptoms develop 2-6 hours later, peaking at 12-24 hours. UV radiation directly damages DNA in keratinocytes and triggers inflammatory cascades. Repeated sunburns significantly increase melanoma risk (5+ blistering sunburns before age 20 increases melanoma risk by 80%). Sunburn is essentially radiation injury to the skin.
Symptoms
- Red, warm, tender skin (develops 2-6 hours after exposure)
- Pain and discomfort
- Swelling (edema)
- Blisters in severe cases
- Fever, chills, nausea (sun poisoning with severe burns)
- Peeling skin after several days as healing occurs
- Itching during healing phase
Severity & Progression
Causes & Risk Factors
- UV radiation from sun (UVB primarily)
- Tanning beds and sun lamps
- Insufficient sunscreen or reapplication
- Prolonged exposure, especially during peak hours (10am-4pm)
- High altitude, tropical locations, snow/water reflection
- Photosensitizing medications (doxycycline, retinoids, NSAIDs)
Treatment & Management
Treatment focuses on symptom relief and allowing skin to heal. Cool compresses or baths provide immediate relief. Aloe vera and moisturizers soothe skin but should avoid petroleum-based products that trap heat. NSAIDs (ibuprofen) reduce inflammation and pain. Topical hydrocortisone can help inflammation. Stay hydrated. Don't pop blisters - they protect healing skin beneath. Severe sunburn with extensive blistering or systemic symptoms may require medical evaluation.
- Cool compresses or cool baths (not ice)
- Aloe vera gel (no petroleum)
- Fragrance-free moisturizers
- Oral NSAIDs (ibuprofen, aspirin) for pain/inflammation
- Topical hydrocortisone 1% for inflammation
- Adequate fluid intake
- Avoid sun until healed
Red Flags & Complications
Seek medical attention if you experience any of the following:
- Dehydration
- Secondary bacterial infection of blisters
- Permanent freckling and pigment changes
- Premature skin aging (photoaging)
- Increased risk of skin cancer (melanoma, SCC, BCC)
- Sun sensitivity during healing
Self-Care Tips
- Get out of the sun immediately
- Apply cool compresses or take cool baths
- Apply aloe vera or moisturizer
- Take ibuprofen for pain and inflammation
- Drink plenty of water
- Don't pop blisters
- Wear loose, soft clothing
- Stay out of sun until fully healed
When to See a Doctor
If sunburn covers a large area (more than 25% of body), causes extensive blistering, or is accompanied by fever >103°F, severe chills, confusion, or signs of dehydration. Seek care for sunburn in infants.
Frequently Asked Questions
How long does it take for a sunburn to show up?
Sunburn symptoms do not appear immediately. The cellular damage happens within minutes of UV exposure, but the classic red, warm, and painful skin usually develops between two to six hours later. The discomfort and redness typically peak around 12 to 24 hours after your time in the sun. This delayed reaction is why people often do not realize they are burning until it is too late.
What is the best way to soothe a bad sunburn?
Focus on cooling the skin and reducing inflammation. Take cool baths or apply cold, damp compresses, but avoid directly applying ice. Use aloe vera gel or a gentle, fragrance-free moisturizer to soothe the area. Avoid heavy petroleum-based creams, as they can trap heat in the skin. Over-the-counter painkillers like ibuprofen can help reduce swelling and discomfort. Ensure you drink plenty of water to prevent dehydration while your skin heals.
Should I pop the blisters on my sunburn?
No, you should never pop or drain sunburn blisters. Blisters indicate a second-degree burn and form a natural, sterile barrier that protects the delicate healing skin underneath. Popping them significantly increases your discomfort and introduces a high risk of bacterial infection, which can lead to scarring and require antibiotics. Let the blisters heal and resolve on their own.
When does a sunburn need medical attention?
You should seek medical care if your sunburn causes severe blistering over a large portion of your body, or if it is accompanied by systemic symptoms like high fever, extreme chills, nausea, confusion, or dizziness. This combination is sometimes called 'sun poisoning' and can be dangerous. Additionally, consult a healthcare provider if you notice signs of infection in your blisters, such as yellow pus or red streaks.
How long will it take for my skin to stop peeling?
Mild sunburns usually heal within three to five days, while moderate sunburns with some blistering may take up to two weeks to fully resolve. Peeling typically starts a few days after the initial burn as your body sheds the damaged skin cells. It is important not to pick or pull at the peeling skin; let it slough off naturally to avoid further irritation or scarring.
Why do I get sunburned even when it is cloudy?
Up to 80 percent of the sun's ultraviolet (UV) rays can pass through clouds, meaning you can still sustain significant skin damage on overcast days. Furthermore, UV rays can reflect off surfaces like water, sand, and snow, increasing your exposure. This makes it crucial to apply broad-spectrum sunscreen and wear protective clothing regardless of the weather, especially during peak UV hours from 10 am to 4 pm.
Does getting a sunburn increase my risk of skin cancer?
Yes, significantly. Sunburn is a clear sign that UV radiation has directly damaged the DNA in your skin cells. Experiencing just five or more blistering sunburns before the age of 20 increases your lifetime risk of developing melanoma by 80 percent. Even mild, repeated sunburns contribute to premature skin aging and elevate your overall risk of various skin cancers, making sun protection a critical lifelong habit.
How can ScanSkinAI help with sunburns or sun damage?
While ScanSkinAI cannot diagnose a sunburn or any other condition, it serves as a helpful screening aid to track your skin over time. If you have a history of severe sunburns, your risk for skin cancer is higher. You can use ScanSkinAI to monitor new or changing moles and lesions in sun-damaged areas. Always share these images with a doctor, as only a qualified professional can provide a medical diagnosis.
Related Conditions
Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.