A customized sealing member is for a customized mask of a pressure support system. The steps to manufacture the customized sealing member include generating surface geometry data of a face of a patient, the surface geometry data corresponding to and representing a surface geometry of the face of the patient; generating customization data using the surface geometry data, the customization data representing how a seal blank should be modified for the patient; and customizing the seal blank using the customization data such that the customized seal blank is shaped according to the customization data.