Bug bites can appear as red, swollen and itchy hard bumps. Common bugs are mosquitoes, fleas, bedbugs, and even spiders, ants and other poisonous insects. The occurrence of red, swollen, itchy hard bumps, because the body’s immune system in the mosquito bite, will release an immune substance called histamine, histamine triggered an allergic reaction to the bite site, resulting in red, swollen, hot, painful symptoms. If the symptoms appear after being bitten by fleas or mosquitoes are generally caused by allergic reactions, you can use anti-allergy drugs such as loratadine, paracetamol, etc., and external application of glycolic lotion or heavy tincture of detoxification. If it is a toxic hornet, ant, or spider bite hard bag, because it contains neurotoxins, formaldehyde, and acetic acid substances, it is recommended to go to the hospital promptly and seek symptomatic treatment. In addition, away from the living environment of mosquitoes and insects prone to breeding places, you can effectively avoid mosquito bites, do a good job of protection, the fundamental problem: 1, try to reduce to the grass, woods, swamps and other wet and watery places to play; 2, do not let the body exposed too much when you go out, you can wear light-colored clothes at night out, so as not to attract insects, exposed skin coated with anti-mosquito dew; 3, indoor use of screens, mosquito nets, etc. Can effectively isolate the mosquitoes close to the body, you can also use electric mosquito incense to expel mosquitoes; 4, avoid going out at dusk and other peak mosquito activity; 5, do not use skin care products containing strong fragrance, perfume, shampoo. Because the scent is easy to attract mosquitoes; 6, pay attention to daily personal hygiene, especially in summer sweating more, higher temperatures, more likely to attract mosquito bites. Frequent bathing, keep clean, remove the body sweat; 7, to change clothes and bed sheets, mats, bedding and other intimate items should often be washed with warm water, in the sun exposure.