An ostomy barrier seal comprising an open-ended conical base 1； and a flange portion 2 extending radially from the base； wherein the conical base 1 has a top opening 3 and a bottom opening 5 for receiving a stoma of a user and the top opening diameter 9 is smaller than the bottom opening diameter 11； such that the stoma of the user fits through the bottom opening and the top opening expands to snuggly fit around and seal along the stoma wall； a related ostomy appliance incorporating the barrier seal； and a related method using the barrier seal to reduce the incidence of waste leakage in an ostomy patients.
