Sunburn - Wikipedia
Sunburn effect (as measured by the UV Index) is the product of the sunlight spectrum at the Earth's surface (radiation intensity) and the erythemal action spectrum (skin sensitivity).

Sunburn: Symptoms & Treatment - Cleveland Clinic
What is sunburn? Sunburn is red, painful, damaged skin from being out in the sun for too long. When you get a sunburn, ultraviolet (UV) rays from the sun (or a tanning bed!) burn your skin. You don’t have to spend the day at the beach or pool to get a sunburn.

What Is Sunburn? Causes, Relief Options, and Prevention - WebMD
Learn about sunburn causes, signs of UV skin damage, at-home relief options, long-term complications, and daily sun protection strategies.

Preventing Sunburn | Skin Cancer | CDC
Sunburn is a sign that the sun has damaged your skin. It's caused by spending too much time exposed to ultraviolet (UV) rays from the sun. Anyone can get a sunburn no matter their race, ethnicity, or skin tone. Sunburn at any age increases a person's risk of getting skin cancer.

Sunburn - Symptoms and causes - Mayo Clinic
The UV light damages skin cells. The immune system reacts by increasing blood flow to the affected areas, which causes the inflamed skin (erythema) known as sunburn. You can get sunburn on cool or cloudy days. Surfaces such as snow, sand and water can reflect UV rays and burn skin too.

Sunburn - DermNet
What is sunburn? Sunburn is an acute inflammatory skin reaction caused by excessive exposure to ultraviolet radiation (UVR) from the sun or artificial sources eg, tanning beds, ultraviolet phototherapy, and welding arcs.

12 Dermatologist-Recommended Tips for Healing a Sunburn Fast - Byrdie
Need sunburn relief? From cooling routines to hydrating tips, explore expert advice and remedies to ease the pain.

Sunburn - UpToDate
Both ultraviolet B (UVB; 280 to 320 nm) and ultraviolet A (UVA; 320 to 400 nm) can cause sunburn, but the wavelengths that are the most effective at inducing erythema are in the UVB range [1,2]. This topic will discuss the pathogenesis, clinical manifestations, and management of sunburn.

Sunburn - Johns Hopkins Medicine
What is sunburn? Sunburn is a visible reaction of the skin's exposure to ultraviolet (UV) radiation (invisible rays that are part of sunlight), or UV light sources, such as tanning salons. The signs of a sunburn may not appear for a few hours. It is typically at its worst at 24 to 36 hours after sun exposure and resolves in 3 to 5 days.

Sunburn - Diagnosis and treatment - Mayo Clinic
Learn more about the diagnosis and treatment of Sunburn. Find tips to get ready for any appointments you need.