A method of manufacturing a customized sealing member (104, 504) for a customized mask (100, 500) of a pressure support system, the method comprising the steps of: 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; wherein the customization data includes first data representing a set of three-dimensional coordinates (310, 312, 314); and wherein the generating customization data step further comprises: employing a predetermined algorithm with the surface geometry data to generate the first data, wherein the surface geometry data has second data representing a localized region (204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244) of the surface geometry; and wherein the employing a predetermined algorithm step further comprises: generating the first data such that the three-dimensional coordinates are each spaced a predetermined distance (316, 318, 320) in a respective predetermined direction (322, 324, 326) from the localized region using the second data; and customizing the seal blank by removing a number of portions of the seal blank using the customization data such that the customized seal blank is shaped according to the customization data. 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; wherein the customization data includes first data representing a set of three-dimensional coordinates (310, 312, 314); and wherein the generating customization data step further comprises: employing a predetermined algorithm with the surface geometry data to generate the first data, wherein the surface geometry data has second data representing a localized region (204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244) of the surface geometry; and wherein the employing a predetermined algorithm step further comprises: generating the first data such that the three-dimensional coordinates are each spaced a predetermined distance (316, 318, 320) in a respective predetermined direction (322, 324, 326) from the localized region using the second data; and customizing the seal blank by removing a number of portions of the seal blank using the customization data such that the customized seal blank is shaped according to the customization data. generating the first data such that the three-dimensional coordinates are each spaced a predetermined distance (316, 318, 320) in a respective predetermined direction (322, 324, 326) from the localized region using the second data; and customizing the seal blank by removing a number of portions of the seal blank using the customization data such that the customized seal blank is shaped according to the customization data.