Bug bites are red and swollen, it is recommended to wash the local area with water and use anti-allergic drugs under the guidance of a doctor. 1. General treatment: after being bitten by a bug, you can use flowing water to rinse the local area, reduce the skin surface residue, avoid excessive scratching to prevent causing infection; it should be noted that after being stung by a bee, you need to remove the stinger and squeeze out the venom, and then rinse; ticks bite to avoid forcible removal, you need to consult a doctor for treatment, so as not to lead to the mouthparts of the residue. 2. medication: when the redness and swelling symptoms are more obvious, you can use Dinaid cream, tretinoin and other topical hormone ointment to apply locally, to achieve anti-allergy, anti-inflammatory effect; itching symptoms are obvious when you can orally take loratadine, cetirizine and other antihistamines to stop itching treatment; accompanied by infections, you can use gentamycin, mupirocin ointment and other medications for anti-infective treatment. After being bitten by the bug, after reasonable treatment can usually disappear quickly, but avoid private medication, so as not to delay the condition.