A Phase 2, Multi-Center, Double-Blind, Randomized, Vehicle-Controlled Study.

A Phase 2, Multi-Center, Double-Blind, Randomized, Vehicle-Controlled Study to Compare the Safety and Efficacy of IDP-122 Lotion (0.01% halobetasol propionate) to Ultravate® (halobetasol propionate) Cream, 0.05% in the Treatment of Plaque Psoriasis.

Key Inclusion Criteria:

• Male or female, of any race, at least 18 years of age (inclusive).
• Freely provides both verbal and written informed consent.
• Is willing and able to avoid prolonged exposure of the treatment area to ultraviolet radiation (natural and artificial) for the duration of the study.
• Subject is willing to comply with study instructions and return to the clinic for required visits.

Key Exclusion Criteria:

• Has spontaneously improving or rapidly deteriorating plaque psoriasis or pustular psoriasis, as determined by the investigator.
• Presents with psoriasis that was treated with prescription medication and failed to respond to treatment, even partially or temporarily, as determined by the investigator.
• Presents with any concurrent skin condition that could interfere with the evaluation of the treatment areas, as determined by the investigator.
• Is pregnant, nursing an infant, or planning a pregnancy during the study period.
• Has received treatment with any investigational drug or device within 60 days or 5 drug half-lives (whichever is longer) prior to the Baseline visit, or is concurrently participating in another clinical study with an investigational drug or device.