After being in the hospital 10 days for a severe bout of aspiration pneumonia, I was found to be in AFib. The cardiologist prescribed various medications, including blood thinners to prevent stroke. A sleep study was also ordered for me. During the sleep study I was found to stop breathing 121 times per hour. Apparently this has caused my AFib as well as other medical problems. I was immediately put on a BiPap. The sleep study determined that the air pressure I need is 21. As soon as I started using the BiPap, I started having problems with leaks at that high pressure. I tightened down the straps as much as I could tolerate, even to the point of bruises and bad chafing on the back of my neck. I only got a couple decent nights on the BiPap before my appointment to speak to the sleep Dr. He reduced my pressure setting to 19 at that time. I could not tolerate the full face mask that included a forehead strap, so I was given a memory foam mask. I was mistakenly given a small mask, which also aggravated the air leak problems. When I was switched to a medium sized mask, the leaks stopped and my sleeping time extended. That's when a new disturbing problem began. Any night that my BiPap indicated that I got 7+ hours of sleep, I woke with an eyelid swollen up horribly. Often there was swelling around the eye, and even a large blister-like swelling below the eye. I did a search about memory foam and found it can cause allergic reactions, including swollen eyes. Thinking that was the problem, I switched to a silicone mask. Last night I got my first long sleep with the silicone mask, and woke up looking like I had been in a prizefight again. My eyelid is swollen to twice it's normal thickness. I have swelling around the eye, and a blister-like eruption on the cheek. So apparently it is not an allergy causing this, but I am at a loss to know what could be causing it. This only happens if I get 7 or more hours of sleep with the mask. Is it from the high pressure or the tightness of the straps? I'd appreciate any feedback.