Which symptoms may occur during a delayed reaction to an insect bite or sting?

Which symptoms may occur during a delayed reaction to an insect bite or sting?

• A. Fever, malaise
• B. Urticaria only
• C. Fever, malaise, headache, urticaria, lymphadenopathy, polyarthritis
• D. Nausea only

Answer: (B)

A delayed reaction to an insect bite or sting most often presents as urticaria, a pruritic, raised wheal-and-flare pattern that appears hours after the bite. This reflects a cutaneous hypersensitivity response where mediators like histamine from mast cells cause the itching and swelling. The hallmark is the skin-focused reaction that develops after a delay rather than right at the bite. Fever, malaise, headache, lymphadenopathy, and polyarthritis imply a broader, systemic process such as a serum sickness–like reaction or another immune complex–mediated phenomenon, which is not the typical delayed skin reaction to a single insect bite. Nausea alone isn’t a characteristic feature of the common delayed cutaneous reaction either. Therefore, the presentation most consistent with a delayed reaction in this setting is urticaria occurring after a delay, rather than the systemic symptom constellation described in the other options. If systemic signs do appear, evaluate for other causes and manage accordingly.

A delayed reaction to an insect bite or sting most often presents as urticaria, a pruritic, raised wheal-and-flare pattern that appears hours after the bite. This reflects a cutaneous hypersensitivity response where mediators like histamine from mast cells cause the itching and swelling. The hallmark is the skin-focused reaction that develops after a delay rather than right at the bite.

Fever, malaise, headache, lymphadenopathy, and polyarthritis imply a broader, systemic process such as a serum sickness–like reaction or another immune complex–mediated phenomenon, which is not the typical delayed skin reaction to a single insect bite. Nausea alone isn’t a characteristic feature of the common delayed cutaneous reaction either. Therefore, the presentation most consistent with a delayed reaction in this setting is urticaria occurring after a delay, rather than the systemic symptom constellation described in the other options. If systemic signs do appear, evaluate for other causes and manage accordingly.