Swollen hard lumps on the leg bitten by bugs can be treated according to the specific situation, such as strengthening care, local application of drugs, oral medication and so on. 1. Enhanced care: if only a swollen hard lump, there is no obvious itching, pain, burning symptoms, you can not special treatment, to maintain local hygiene, do not scratch and do not contact with pollutants, generally can be recovered on their own. 2. Local treatment: for obvious itching, pain and burning symptoms, can be applied locally methylprednisolone acetate, tretinoin cream and other glucocorticosteroid ointment to relieve, if only itching, burning, can be applied with peppermint glycerite lotion to relieve. If it is only burning and pain, you can use a towel to apply cold compresses or rinse with running water, and then apply glucocorticosteroid medication. 3. Oral medication: for particularly severe itching, or multiple hard lumps, this situation can be oral cetirizine, loratadine and other drugs systemic treatment. Swollen hard lumps on the legs bitten by insects should be selected according to the degree of the condition of the appropriate treatment, if you need to use medication, you should strictly comply with the doctor’s instructions.