Sunburn is a common skin condition that occurs when the skin is exposed to ultraviolet (UV) radiation from the sun. This exposure damages the proteins, fats, and DNA in the cells of the epidermis, the upper layer of the skin, leading to inflammation. UVB radiation is primarily responsible for causing sunburn, while UVA rays contribute to a lesser extent.
When the skin is damaged by UV radiation, it triggers an inflammatory response in the body. Skin cells release inflammatory molecules that dilate blood vessels in the dermis, the layer beneath the epidermis, leading to increased blood flow to the skin. This influx of immune cells further amplifies the inflammation, resulting in redness, swelling, pain, and peeling of the skin.
In individuals with lighter skin tones, sunburned skin appears pink or red due to increased blood flow. On the other hand, those with darker skin tones may experience varying shades of red, grey, brown, or black. In severe cases, sunburn can lead to blistering, where damaged skin cells self-destruct, forming fluid-filled blisters on the skin.
The healing process of sunburned skin begins with immune cells producing anti-inflammatory molecules a few days after UV exposure. This self-resolving inflammation reduces redness, swelling, and pain over time. Stem cells in the epidermis accelerate healing by generating new skin cells to replace the damaged ones, aiding in the shedding and peeling of the skin.
While there is no conclusive evidence that after-sun or aloe vera gels expedite the healing of sunburn, they can provide relief by cooling the skin. Cold showers, cold compresses, and pain relievers like paracetamol or ibuprofen can also alleviate discomfort associated with sunburn.
Long-term effects of sunburn include DNA damage to the stem cells in the epidermis, which can increase the risk of developing skin cancer. Accumulated genetic mutations from UV exposure can lead to uncontrolled cell growth and division, raising the likelihood of skin cancer, such as melanoma.
Preventing sunburn involves understanding the UV index and applying sunscreen with at least SPF 50 when the index is 3 or higher. Staying out of the sun during peak hours, wearing protective clothing like hats and long sleeves, and using free UV index apps can help minimize sunburn risk. By incorporating these preventive measures, individuals can safeguard their skin from the harmful effects of UV radiation.
