I have ptosis in one eye and have currently developed blepharitis in that eye and my ptosis is now worse. Will that go away when the infection does?

Eye Doc ASAP. You need to see an eye doctor immediately to find out the cause since this may have serious consequence. If you can't get to one within a few hours, go to the ER now. Ptosis alone may just be a neurologic issue but with the lids inflamed one needs to rule out an abscess.