Stinging fire ant and local reactions to stings

Picture A depicts a stinging fire ant (Solenopsis invicta). Pictures B, C, and D reveal the different local reactions that can occur following a sting. Picture B reveals several wheal-and-flare reactions (arrows), which may occur within minutes after the sting. Pictures C and D show a sterile pustule and cutaneous late-phase allergic reaction with an excoriated sterile pustule, respectively.