The neck itches in hot weather, and it will turn into a red lump with a slight scratch. What is this?

In summer, the skin will itch, and the itchy parts vary from person to person, such as calves, thighs, trunk, especially waist, which are all common parts. For men who often wear pants in summer, thighs, calves and groin are prone to skin itching in summer. The temperature is high, and the pants have poor air permeability and do not absorb sweat, especially the jeans are thick, so the temperature in the trouser legs is high, and it is humid after sweating, so the skin cannot drive sweat. The temperature will definitely rise. For treatment and prevention, we should pay attention to the material of clothes. It's best to choose pure cotton material, and don't wear jeans on a hot day unless you often work in an air-conditioned office. If conditions permit, you can gently wipe the sweaty skin with a wet towel, and fan the wind to evaporate the water, which will make you feel comfortable and cool immediately. Fungal infection is most suitable for fungal growth and reproduction in hot and humid summer, especially most materials have poor air permeability and are not easy to absorb sweat. Results Tinea mainly occurs in love sweating, such as trunk, armpit, groin and buttocks. Therefore, sweat spots, tinea cruris and tinea pedis caused by fungal infection are the main causes of skin itching in summer. Sweat spots mostly grow on the trunk, that is, the back, shoulders and waist, and are widely distributed. Sweat spots are many small dots centered on pores, which are white in color, and similar plaques will merge into some large plaques. At first, they were light pink, which was time-consuming. Finally turned white, slightly itchy, but not painful. Some people feel wet and itchy in the groin, buttocks and feet, especially between toes and soles of feet in summer. Brown patches will appear in the groin and buttocks, and the color will become darker after a long time. Toes and soles will blister and peel. Similarly, it is necessary to keep the fabric texture ventilated and keep the skin cool and dry. The main component of the liquid is an alcohol solution that inhibits fungi. The former is mostly used for sweat spots, and it is applied once a day after bathing, about one or two weeks. For tinea cruris and tinea pedis, use some ointment and cream to inhibit fungi once every morning and evening, and then use it for a week or two until the skin returns to normal. Contact dermatitis is still very common in summer. Some contact dermatitis will worsen or recur in summer. It may be that sweat easily dissolves allergens and sticks to moist skin, so allergic inflammatory reaction occurs, and itching is the first symptom. To understand the seasonality of skin pruritus, we must master its pathogenic factors, so that the treatment and treatment methods are more accurate. Many people with itchy skin and eczema in winter will itch as soon as the autumn wind cools every year, and the itchy part is not necessarily near the waist. Shoulder, face and back of hand. At first, the skin was only slightly itchy, not red and swollen. Patients often scratch with their hands, and the more they itch, the more they scratch, or take a bath when they itch, and the more they itch, the more they wash. Most patients will find that the itchy part of the skin will be scalded with hot water, and the itching will be eliminated immediately, so use hot water when it itches, and use hotter water when it is scalded, which will temporarily make the skin unconscious. Skin will desquamate and pigmentation. Over time, the skin will thicken. Treatment and prevention should avoid washing and using overheated water. Regular washing will make the skin drier. If there is no post-bath treatment, overheated water will not only stimulate the skin strongly, but also defat it. 3. Never scratch with your hands. Many people with facial dermatitis, especially women, will feel itchy in winter if she keeps using it. She doesn't think cosmetics are the culprit, but some people's skin changes greatly with the seasons. If cosmetics are water-based, such as lotions and creams, it will accelerate the evaporation of epidermal moisture, making the situation of dry skin more serious in winter, while dry skin can not adapt to many cosmetics, especially water-based, and its first clinical symptom is itchy skin.