It's actually very rare for insect bites to become infected.
[patient.info]
Predisposing conditions for cellulitis include insect bite, animal bite, pruritic skin rash, recent surgery, athlete's foot, dry skin, eczema, burns and boils, though there
[360oandp.com]
Make sure that any open wounds, abrasions or insect bites are cleaned promptly and treated with and over-the-counter antibiotic cream.
[sheknows.com]