Flea bites are not contagious, and flea bites are not a contagious disease. Flea bites can be itchy, painful and other manifestations of the need to apply the correct medication under the guidance of a physician. Flea bites belong to the insect bite dermatitis, caused by the bite of the insect allergic diseases, because the disease is allergic diseases, does not belong to the infectious disease, so it will not be infectious. Flea bites first need to wash the affected area with water or soapy water, can be used with topical glycerine lotion can achieve anti-inflammatory, anti-itching effect, the symptoms are more serious, can be applied under the guidance of a physician cetirizine and other drugs to treat, but severe renal insufficiency, pregnant women and women in pregnancy is prohibited by this drug. In addition, it should be noted that, because fleas are alive, contact with people or animals with fleas may lead to the appearance of fleas on their own body, and induce insect bite dermatitis, pay attention to skin cleanliness. If necessary, you need to go to the hospital, the physician according to the condition of the treatment.