clear mucus drainge under lip. constant excessive ..feels like there is no nasal tissue left.. drainage is down the front of mouth . feels like muscles are pressing into sides of nostrils holding them closed.. muscles in lower back of neck constricting at same time.. airway is open?? Could something have collapsed??shrinage.. It is not sinus..or allergy.. Did have nasal surgery that resulted in removal of 90% percent of tissue. This has bren getting worse and now the muscles on either side of the nose have atroped or collapsed to the bottom on the nose. ENT's do not help..CT scan has only shown tissue loss.