After being bitten by fleas on cats, if the lesions are small, you can apply topical compound beclomethasone camphor cream or dermatol ointment in small amounts once in the morning and once in the evening to effectively stop the itching, and pay attention not to pick and scratch or squeeze the lesions to avoid breaking infection. If the itching is severe, oral antihistamines such as loratadine and cetirizine can be taken at the same time to help relieve the itching. It is also necessary to actively search for fleas to remove them and not to touch small animals such as cats and dogs that have fleas. If there are more lesions, or if there is a serious allergic reaction, it is recommended to give glucocorticoids orally, or you can also give Depo-Provera solution intramuscular injection treatment. If there is fever and discomfort, it is necessary to seek medical attention to improve the relevant examination and actively give treatment.