What is a characteristic of fire ant bites?

A characteristic of fire ant bites is that they typically result in the formation of painful fluid-filled vesicles. When fire ants bite, they use their mandibles to hold on to their victim while simultaneously injecting venom through a stinger. This venom causes an immediate burning sensation and often leads to the development of small, red bumps that can turn into vesicles filled with fluid. These vesicles can be very itchy and painful, and they often become more pronounced over time.

The other options describe phenomena that are not associated with fire ant bites. Deep tissue necrosis is commonly linked to certain types of wounds or insect bites but is not characteristic of fire ant bites. The injection of a potent neurotoxin causing paralysis does not occur with fire ant bites; their venom primarily elicits a local reaction without systemic paralysis. The "bulls-eye" appearance is reminiscent of certain other insect bites or diseases, such as Lyme disease from tick bites, but is not a feature of fire ant sting reactions. Thus, the presence of painful, fluid-filled vesicles is the defining characteristic of the reaction caused by fire ant bites.