a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions
同义词：wale, welt, weal
wheal详细解释
wheal n.（名词）A small swelling on the skin, as from an insect bite, that usually itches or burns.疹块：皮肤上的小隆起肿块儿，如被虫咬过后，常瘙痒或伴随有灼伤感 来源：Probably alteration of wale 可能为 wale的变化
