There is a part of skin left without protection after removing fleas from their implantation place and it becomes a “gateway” to be infected. These infections are often complicated by bacterial purulent may cause the spread of infection of the skin. Another factor that may cause purulent infections of the skin is itching. Pets are scratching making the skin damaged and infected. You should remember that tick bite causes not only the local inflammatory reactions of the skin, but also there is a risk of infection by a human or an animal disease transmitted by ticks.