The baby’s feet are hard and swollen after being bitten, can be bee stings, ticks or mosquito bites and other local inflammatory reactions, should promptly seek medical attention to identify the cause, under the guidance of the doctor symptomatic treatment. 1. If the skin is hard and swollen after a bee sting, you should pull out the stinger, squeeze out the venom, rinse with water, you can apply a wet compress to the local area, if the symptoms of systemic poisoning is obvious, you should go to the hospital and actively rescue: if the mosquito bites, wash the local area with soap and water, rub glycerine lotion to stop the itching. 2. When there is a tick bite, do not forcibly pull out the body of the insect, so as not to break the mouthparts in the skin, can be used as a local anesthetic such as lidocaine or ether coated in the head of the tick, to be pulled out of their own loose mouth, and timely disinfection of the wound, when there are secondary infections should be used in local or systematic application of antibiotics such as azithromycin to fight infections. 3. If itching is obvious, local topical glucocorticoid cream or internal antihistamine such as loratadine can be used to relieve itching. Indoor mosquitoes or go out need to pay attention to the baby’s protection, if the local skin lesions are serious, it is recommended to consult a doctor in a timely manner, symptomatic treatment, and comply with the doctor’s instructions for the use of drugs.