Adrenal Suppression and Absorption Study of Halobetasol Propionate Foam in Subjects 12-17 With Plaque Psoriasis

Key Inclusion Criteria: * Subject is male or non-pregnant female and is 12 to less than 18 years of age * Subject has provided written informed assent and was accompanied by the parent or legal guardian at the time of assent/consent signing * Subject has a clinical diagnosis of stable plaque psoriasis involving a minimum of 10% Body Surface Area (BSA) * Subject has an Investigator's Global Assessment (IGA) score of at least three (3 = moderate) at the Baseline Visit Key Exclusion Criteria: * Subject has spontaneously improving or rapidly deteriorating plaque psoriasis * Subject has guttate, pustular, erythrodermic or other non-plaque forms of psoriasis * Subject has a physical condition which, in the investigator's opinion, might impair evaluation of plaque psoriasis, adrenal axis function or which exposes the subject to an unacceptable risk by study participation * Subject has had prolonged exposure to natural or artificial sources of ultraviolet radiation * Subject is pregnant, lactating, or is planning to become pregnant during the study * Subject is currently enrolled in an investigational drug or device study