After the baby was bitten by the bugs, the skin redness, swelling and hardness of the bites are mostly allergies caused by skin diseases, according to the seriousness of the situation can be self-canceling, topical medications, oral medications and other methods of treatment. 1. Self-reduced: baby bug bites only local redness, swelling, hard, and mild symptoms, generally do not need special treatment, can be left to subside on their own. 2. Topical medication: If the redness, swelling and hardness is large or itchy, you can choose to apply topical medication to stop the itching, such as compound glycerite lotion. 3. Oral medication: If the baby was bug bites red swelling hard situation is more serious, you can also add oral medication, such as cetirizine hydrochloride, loratadine and other antihistamines. If the baby baby bug bites red swelling hard symptoms are more serious, or has not been improved, it is recommended to go to the hospital in a timely manner, so as not to miss the opportunity for treatment. All of the above medication should be used under the guidance of a doctor, avoid self-medication.