Prosthetics technician
From Tardis Wiki, the free Doctor Who reference
Prosthetics technicians were members of the crew, typically informally attached to the makeup department, often actually employed by a prosthetics subcontractor, like Millennium FX. They applied and maintained prostheses created by a prosthetics designer, like Neill Gorton, to actors. They usually reported to a prosthetics supervisor.
Though the basic task existed in the 1963 version of Doctor Who, they've been formally credited only in DWU shows made in the 21st century.