Fight sunburns all the time
For any outing or outing, mountain climbing or paddling, we will book a time to bathe in the sun.
Everything grows on the sun. The bright and bright sunlight of nature can not only make people happy, but also promote the metabolism of the human body and the functional activities that are good for the internal organs.
On the skin, sunlight can increase sweat gland secretion, dilate blood vessels, and help synthesize vitamin D.
Bronze skin after proper sun can beautify people’s appearance and make people tremble.
However, things are always divided in two.
Excessive or inappropriate sun exposure is bad for the body.
Through the prism, you can see that the sunlight has 7 colors, namely red, orange, yellow, green, cyan, blue, and purple, which are visible light.
In addition, sunlight includes ultraviolet and infrared rays.
Different wavelengths of ultraviolet light affect the skin at different depths, and the longer the wavelength, the stronger the penetrating power.
The 320nm medium-wave UV is mainly absorbed by the epidermis, some of which reach above the dermis, which can cause sunburn and chronic skin damage, skin erythema, pigmentation, skin aging, degeneration, hyperplasia, and even canceration.
400 nanometers of long-wave UV can reach the dermis, which can act on blood vessels and other tissues. After sensitization with photosensitizing drugs or food, sunlight can cause photoallergic dermatitis, which is mainly related to long-wave UV.
There are five main types of skin diseases related to sun exposure: First, sunburn caused by continuous exposure to strong sunlight can cause diffuse erythema on the skin of the exposed area.
It is bright red at first and gradually dark red later, and may have burning or stinging sensation.
3 short-term desquamation, leaving brown pigment calm and healed.
Severe skin swelling or blisters may occur.
The main prevention is to avoid activities and working hours in the sun, and the strongest time to avoid sun exposure when working outdoors and sunbathing (10 am to 2 pm).
Apply sunscreen to your face and exposed limbs before sun exposure.
After sun exposure or sunbathing, apply cream on the skin (you can add 20% castor oil or an appropriate amount of concentrated vitamin A) or mash it with fresh cucumber peel for external application.
Second, chronic skin damage caused by long-term sunlight exposure Long-term sun exposure workers such as seafarers, geological survey workers, farmers, athletes, etc. In the long-term sun exposure areas such as the face, neck, thoracic triangle area, exposed limbs, etc., the skin is often significantly dry and rough, Desquamation, pigmentation, atrophy, wrinkles and loss of elasticity.
Some people have hypertrophic skin at the back of the neck, with deep skin lines that form diamond-shaped skin at the neck.
Older people’s skin aging, such as wrinkled skin, dryness and pigmentation, are seen on the exposed parts of the face and limbs, and are also associated with long-term sun exposure.
Third, the precancerous disease caused by sunlight-solar keratosis. This disease occurs in elderly people who have been exposed to the sun for a long time. It often occurs in exposed parts of the face, ears, and back of the hand.
Most of them are wart-like pimples with a few or a few grains of rice to broad beans that are much higher than the surface of the skin. The surface has dry cuticles, which are not easy to peel off.
Forcible exfoliation is the flushing of the exuding surface, it is easy to bleed, and there may be capillary dilatation around it.
20% of the disease can develop into cancer, so promptly ask a dermatologist for thorough surgery or cryotherapy after diagnosis.
Fourth, skin diseases caused by sun exposure after internal or external application of certain light-sensitive substances. Some people have eaten certain foods such as quinoa (gray lettuce) or mud snails for one to several days. Redness and swelling appear on the back of the sun and the back of the hand.
Some people take certain drugs orally such as thiamine, tetracycline, chlorpromazine, psoralen, etc. after exposure to light can also cause dermatitis.
Some people may have symptoms of skin inflammation such as redness, swelling, and exudation at the irradiation site after external application of drugs or cosmetics.
Therefore, people should be more alert and consult a dermatologist when similar symptoms appear. If necessary, perform a spot test to help diagnosis.
Fifth, the diseases that can be induced or aggravated by sunlight. Certain diseases cause or worsen the condition after sun exposure.
The most obvious is lupus erythematosus.
30% of patients with lupus erythematosus are sensitive to sunlight.
These patients should avoid the sun as much as possible. They should use sunscreen, umbrellas or wide-brimmed hats, wear light-colored long-sleeved tops and trousers when going out, and avoid taking photosensitivity drugs.
Facial melasma is more common in summer and the south, suggesting that sunlight is one of the causative factors.
People with albinism have skin, hair, and eyes that are prone to sunburn due to lack of melanin protection. When going out, they should avoid light, wear black glasses, and use sunscreen.