What causes sun spots? What is the pathogenesis of sunburn?

Sunburn is also called sun spots. Many people will experience peeling, acne and other phenomena after being exposed to sunlight. This disease is mainly prevalent in summer, and many patients do not know why these symptoms occur.

What causes sun spots?

Sunlight includes ultraviolet light, visible light, and infrared light. Among these three types of light, ultraviolet light is the most harmful to the skin. Ultraviolet light is divided into short-wave ultraviolet light, medium-wave ultraviolet light, and long-wave ultraviolet light. These three different wavelengths of ultraviolet light will be absorbed by different layers of skin tissue.

In nature, the absorption and scattering of air, clouds, dust particles, water vapor, etc. in the atmosphere can filter out short-wave ultraviolet rays and protect the human body from harm, while long-wave ultraviolet rays only act on individuals with photosensitivity, so it is medium-wave ultraviolet rays that are the most harmful to the human body.

Secondly, phototoxic reaction is a non-immune reaction that can occur in any population. After some parts of the skin are exposed to the sun, skin damage such as redness, swelling, and blisters will appear within a short period of time. Long-term and repeated exposure to sunlight can cause the skin to become loose, the surface of the skin to become dry, rough and atrophy, and pigmentation and hypopigmentation to occur. Photoallergy is also an immune reaction.

Many people have a lot of photosensitive substances in their bodies, which will react after being exposed to ultraviolet light. The pathogenic factor is long-wave ultraviolet light. The clinical characteristic of photoallergy is that it only occurs in a small number of people with allergic constitutions. Moreover, when they first come into contact with photosensitive substances and are exposed to sunlight, an inflammatory reaction will not occur in a short period of time, but there is a certain sensitization period, which generally takes one to two days or longer to occur.

The above is what experts tell you about the pathogenesis of sunburn. I hope that the above content can be of some help to everyone. Warm reminder: If you suffer from sun spots, please go to the hospital for treatment in time to avoid worsening of the disease and affecting your work and life. Once again, I wish you all success in removing freckles soon.