The mouth of the sore will soon heal up.

疮口即将愈合。

The cut will soon heal up.

伤口很快就会愈合。

Will it heal up during my stay here?

我在此地停留期间它会愈合吗？

The cut will heal up in a few days if you keep it clean and dry.

这个伤口只要保持清洁干爽，过不了几天就会愈合。

It can corrade glass, burn skin and make skin fester and make injury hard to heal up.

能侵蚀玻璃，能灼伤皮肤而使之溃烂，伤口愈合极慢。