Found this in PA's rules for COVID and wearing a mask. Within this the article says you do not need to wear a mask if, Your mask prevents you from seeing, or if you have a medical condition that could be compromised by wearing a mask. Additionally, if the mask makes the task at hand impossible, you don't have to wear it. If you are not wearing a mask due to a medical condition, you will not be turned away from a businesses, and the business is not allowed to ask for medical documentation.