Black and red fire ant bites commonly cause blisters and pustules that usually develop within a few days of initial contact, states WebMD. This is a normal reaction; in most cases, the blisters go away on their own. Normal reactions to most insect bites include redness, swelling, itching and pain. Swelling of more than one-third of the bite location can indicate a severe allergic reaction.
Blistering is a common allergic reaction to bed bug bites, reports the Mayo Clinic. Bed bug bites are typically located on the face, neck, hands and arms. The bites appear in lines and clusters and are red and itchy. It is important for individuals who experience blistering or hives following a bed bug infestation to consult with a physician as soon as possible to ensure proper treatment of the allergic reaction.
Impetigo is a secondary infection that sometimes follows insect bites and causes fluid-filled blisters, rashes and skin sores, says Medline Plus. Insect bites that cause breaks in the skin are more prone to becoming infected with the bacteria that causes impetigo. Impetigo is treated with antibacterial creams and, in severe cases, antibiotics. Impetigo is treatable in most cases, but the infection tends to recur in children who reside in unhealthy living conditions.