After the insect bite, if the patient has redness and swelling with itching, you can first use alkaline substances, such as soap and water, to apply and wash locally on the redness and swelling, which can effectively relieve the itching. Then apply the appropriate amount of flower lotion, safflower oil, cool oil, wind oil and other common household items to reduce swelling and relieve itching. For patients who do not have the above-mentioned items around, they can cut open aloe vera and take a small amount of juice to apply, which also has a good effect, or apply a small amount of toothpaste, which contains mint ingredients and has a certain role in relieving itching and swelling. If the symptoms gradually worsen, the redness gradually spreads and expands, and is accompanied by tingling or large flaky papules, then the insect bite dermatitis is considered to have arisen, and the patient needs to seek medical attention and take medication under the guidance of a doctor. Common medications for insect bite dermatitis include corticosteroid preparations such as Denide cream, hydrocortisone butyrate cream, compounded flumethasone ointment, halometasone cream, etc. Oral antihistamines such as benadryl, promethazine hydrochloride, chlorpheniramine maleate, loratadine, etc. can be taken at the same time. Generally, the lesions can disappear gradually in 7-10 days. After disappearing, patients need to pay attention to personal hygiene and do a good job of insect prevention measures, change bedding and clothes regularly, cut nails regularly, and avoid activities in mountainous areas and woods where there are too many mosquitoes.