@ZipLine-- You can definitely use it as a spot treatment, that's what I do. I just dab some on my pimples before going to bed. You could also leave it on for a few hours and then wipe it off, but I like to leave mine on overnight so that it really works.
I don't think that zinc ointment gets rid of blemishes. But since it dried out pimples, it will speed up recovery. You won't have to wait for the pimple to mature, drain and scab over on its own. Zinc ointment will dry it out and the spot will fade over the next few days.