I won't call it road rash because it happened on the mtb trail Anyway, I have some on my shoulder and a couple of other places. Is it better to cover it or leave it open?

I've the idea that it is best to clean it, which I've done, put antibiotic cream on it but to leave it open to the air. These are not large spots - the area on my shoulder is the largest and is about the size of a large egg.