蚊虫叮咬后，他的腿上出现了一个红肿发痒的肿块。

After the mosquito bite, a red itchy ___wheal formed on his leg.

蚊子叮咬后，我的手臂上出现了一个红色的小肿块。

After the mosquito bite, a small red ___wheal appeared on my arm.