When I wake up in the morning I see strap marks on my face. Is that a problem?

If the marks resolve quickly after awakening, then it’s not really an issue. If however, the marks progress toward pressure sores, then your mask is to tight. Remember, a tight fit is not necessarily a proper fit. A common error is to pull the headgear straps very tight. Newer masks are made of thinner, softer material which allows the mask to respond to body heat, thereby negating the need for pressure to ensure a leak free fit. Also, if you have persistent issues with masks, a zinc-oxide based adhesive tape on the sensitive areas may help alleviate the problem.