Sunburn: Degrees, Treatment, and Prevention

Sunburn is an inflammatory reaction of the skin caused by excessive ultraviolet (UV) radiation. This comprehensive guide covers degrees from mild to severe, treatment methods, the meaning of SPF, and strategies to protect against skin cancer.

Makes up 95% of the UV in sunlight that reaches us
Can pass through clouds and glass
Penetrates the deeper layers of the skin (dermis)
Causes premature skin aging (photoaging), wrinkles, and pigmentation
Contributes to DNA damage and the risk of skin cancer
Its intensity remains relatively constant year-round and throughout the day

Makes up 5% of the UV that reaches us but is more energetic
Affects the epidermis (the upper layer of the skin)
Is the principal cause of sunburn
Stimulates vitamin D synthesis
Causes mutations and skin cancer by directly damaging DNA
Its intensity is highest in summer, around midday, and at high altitudes

The most energetic, but completely absorbed by the ozone layer
Does not reach the Earth's surface under natural conditions
Care is required around artificial sources (disinfection lamps)

Release of prostaglandins, cytokines, and histamine increases in the damaged cells
Blood vessels dilate (vasodilation), producing skin redness (erythema)
Vascular permeability rises, leading to edema and swelling
Nerve endings are stimulated, producing pain and tenderness
In severe cases, the epidermis separates from the dermis and blisters (bullae) form
Damaged cells undergo apoptosis (programmed cell death) — seen histologically as "sunburn cells"

Findings: redness, tenderness, mild swelling, sensation of heat
Blisters: none
Healing: within 3–5 days, with peeling
Scarring: usually none

Findings: intense redness, marked pain, edema
Blisters: clear fluid-filled blisters (bullae) form
Additional symptoms: fever, chills, weakness, headache (signs of sun poisoning)
Healing: 1–3 weeks; with proper care usually no scarring

Type I: very fair skin, red/blond hair, freckles — always burns, never tans (highest risk)
Type II: fair skin, blond/light brown hair — burns easily, tans minimally
Type III: medium skin — sometimes burns, tans gradually
Type IV: olive/wheat-colored skin — rarely burns, tans easily
Types V–VI: dark skin — very rarely burns (though skin cancer risk is not zero)

Time of day: UV intensity peaks between 10:00 and 16:00
Altitude: UV intensity rises by 4% for every 300 m of elevation
Reflection: snow (80%), water (25%), and sand (15%) reflect UV
Latitude: UV intensity increases closer to the equator
Medications: tetracyclines, doxycycline, NSAIDs, amiodarone, and thiazide diuretics increase phototoxicity
Cloudy weather: up to 80% of UV radiation can pass through clouds — burns can occur on cloudy days too

Aloe vera gel: anti-inflammatory and moisturizing effects are well documented; soothes the skin and supports healing
Moisturizing lotions: prefer fragrance-free, alcohol-free products
Cold yogurt or milk compress: a traditional method that provides relief
What to avoid: petroleum jelly, oil, butter, toothpaste — these trap heat and worsen the damage

Ibuprofen or naproxen: provide both analgesic and anti-inflammatory effects; if started early, may limit progression of the burn
Paracetamol (acetaminophen): provides pain relief
Topical hydrocortisone cream (1%): for short-term use reduces itching and inflammation

Do not pop the blisters — doing so increases infection risk and the blister itself acts as a natural protective barrier
If blisters open spontaneously, keep them clean and apply an antiseptic dressing
Seek medical care if signs of infection appear (increased redness, pus, fever)

High fever and chills
Nausea, vomiting
Headache, dizziness
Weakness and confusion

Photoaging: wrinkles, age spots, skin thickening, loss of elasticity
Actinic keratosis: precursor lesion to skin cancer
Basal cell carcinoma: the most common type of skin cancer, linked to cumulative UV exposure
Squamous cell carcinoma: linked to chronic sun damage
Melanoma: the most dangerous skin cancer — severe sunburns in childhood double the risk; five or more severe burns increase melanoma risk by 80%

SPF 15: filters out 93% of UVB
SPF 30: filters out 97% of UVB
SPF 50: filters out 98% of UVB
SPF 100: filters out 99% of UVB

Amount: half a teaspoon for the face, about 30 ml (a shot glass) for the whole body
Timing: apply 15–30 minutes before sun exposure
Reapplication: every 2 hours; reapply immediately after swimming, sweating, or toweling off
Lip protection: use an SPF lip balm

Physical (mineral) filters: zinc oxide, titanium dioxide — reflect UV; preferred for sensitive skin and children
Chemical filters: oxybenzone, avobenzone — absorb UV and convert it to heat; easier to apply

Clothing: UPF (Ultraviolet Protection Factor)-rated clothing, wide-brimmed hat, UV-protective sunglasses
Shade: avoid the sun between 10:00 and 16:00 whenever possible
Shadow rule: if your shadow is shorter than your height, UV intensity is high
Windows: car and building glass blocks most UVB but lets UVA through

A (Asymmetry): one half of the mole differs from the other
B (Border): irregular, notched, or blurred edges
C (Color): more than one color (brown, black, red, white, blue)
D (Diameter): larger than 6 mm (the size of a pencil eraser)
E (Evolution): change in shape, size, color, or other features

Fitzpatrick's Dermatology, 9th Edition — Chapter: Sunburn and UV Radiation
Harrison's Principles of Internal Medicine, 22nd Edition
American Academy of Dermatology — Sun Protection Guidelines, 2024
WHO — Ultraviolet Radiation and the INTERSUN Programme

Sunburn: Degrees, Treatment, and Prevention

Dr. Emre Gecer

Related Articles

Sci-Stalker: AI Software Tracking the Conversion of Congress Abstracts into Scientific Publications

Computer Science and Cryptography: Foundations of Digital Security

Cybersecurity: A Comprehensive Guide