What are many small white spots on the body and how to treat them?

White spot disease is a very common disease. When the water temperature rises above 30 degrees, it will basically be fine in 2 or 3 days. If not, there are medicines and fish shops to sell. This disease, which specializes in treating leukoplakia, is caused by protozoa. This pathogen is called white spot worm, which will go deep into skin cells and reproduce asexually to form white spots. Goldfish with this disease are covered with white spots, and there are many young white spot worms in each white spot cyst. White spot worms absorb nutrients from fish tissues, grow and increase their numbers. Later, they broke out of the cyst, swam into the water, and then returned to the fish to attack the skin, forming more white spots. At the beginning of the disease, the sick fish will rub hard objects with their bodies, hoping to get rid of the nasty pathogens. If not treated immediately, the sick fish will be seriously damaged and die soon. A fish friend asked, the white spots will disappear after painting the whole cylinder, and will appear again after a week or two. Always like this. Why? This is also a problem that fish farmers often encounter. General drug treatment can directly kill adults, but the problem is that drug treatment can only kill adults, and its larvae can be hidden in fish skin, so the drug can not be deepened, so it will be repeated. Some books say that white spots can be removed by raising the water temperature to 30 degrees, but for most fish, the temperature is too high for fish to stay in water at this temperature for a long time, so even if the white spots are cured, it may cause other problems. It is recommended to take medicine and get more sunshine, and the water temperature should be the same when changing water. After the white spots disappear, you can insist on using some water purifying agents every day, and the white spots will be completely cured.