I can't. I sprained my, um... I have a rash.

我不行 我扭伤了我的 我起了疹子。

Did you know you have a rash on the bottom of your feet?

你知道你脚底起疹子了吗？

If you, as an individual, see that you have a rash you're not sure what the rash is but it might look like bug bites.

如果你，作为一个个体，看到自己起了皮疹，而且你不确定这个皮疹是什么，但它可能看起来像虫子叮咬。