It's getting hotter recently. I changed my summer coat, and found that I had a lot of this kind of little red dot in just a few days. What is asking for help?

It may be a rash or prickly heat. I hope you can develop good living habits. If it is serious, it is recommended to go to the hospital. Rash is a common superficial inflammatory skin disease in summer or hot environment. Because in the hot and sultry environment, a large amount of sweat is not easy to evaporate, which makes the stratum corneum swell, the sweat duct narrow or blocked, which leads to sweat retention, sweat extravasation to the surrounding tissues, forming papules, blisters or pustules, which are easy to occur in folds. Because of the high temperature and humidity in the environment, it is difficult to evaporate due to excessive sweating. Sweat soaks into the cuticle of epidermis, which narrows or blocks the orifice of sweat gland duct. After the sweat in the sweat gland duct stays, it breaks due to the increase of internal pressure, and the spilled sweat penetrates and stimulates the surrounding tissues, resulting in papules, papules and vesicles at sweat pores. Bacteria multiply to produce toxins, which can aggravate the inflammatory reaction. Some people think that the blockage of sweat pores is due to primary staphylococcal infection, while others think that the occurrence of miliaria has nothing to do with excessive sweating, but is related to the proliferation of micrococcus on the skin surface. I hope my answer will be helpful to your study, and I hope you will be healthy and have all the best.