What are the symptoms of bed bug bites?

The symptoms after bed bug bites mainly include the following aspects: 1. Skin reactions: The bitten area may develop hive-like papules accompanied by intense itching, which is an immune response caused by chemicals in the bed bug's saliva. Tiny pinpoint-sized petechiae, vesicles, or even large erythematous or purpuric patches may also appear on the skin. These skin lesions may be arranged in a linear pattern or clustered together. 2. Systemic symptoms: In some cases, bed bug bites may lead to systemic allergic reactions such as headache, joint pain, fever, fatigue, and nausea. These symptoms can vary among individuals and may be influenced by factors including the bite location, time of the bite, and the person's individual allergic response. 3. Secondary infection: Excessive scratching of bed bug bite marks may lead to bacterial infection, causing increased redness, swelling, pain, and exudation around the bite area. If symptoms are severe or persist without improvement, prompt medical attention should be sought.