孩子被蚊子叮咬腫很大、起水泡是過敏體質嗎？
重點摘要 (TL;DR)：
5歲以下孩童對蚊子唾液中的蛋白質較無耐受性，被叮咬後免疫系統反應較激烈。若有過敏體質或體內 IgE 濃度較高的族群，更容易出現明顯硬塊、嚴重腫脹甚至起水泡。此過敏現象通常在5歲過後至青少年時期會逐漸改善。
為什麼嬰幼兒被蚊子叮咬反應劇烈？
5歲以下的孩子，一般對於蚊子唾液中的蛋白質，他沒有耐受性，所以免疫系統的反應會比較激烈，尤其是過敏體質、身體 IgE 濃度會比較高的族群，反應會更激烈。
幾歲後蚊蟲叮咬反應會改善？
大部分在5歲之後，趨近於青少年時，這個反應會越來越少。
嚴重腫塊、起水泡一定是過敏體質嗎？
所以出現摸起來很硬、腫得很誇張，甚至起水泡，的確有可能是過敏體質沒錯，但並不是只有過敏體質的孩子才會這樣，只是過敏體質的人比例比較高。
參考資料：
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