Evaluate Safety and Tolerability of Calcipotriene Foam 0.005% in Pediatric Subjects With Mild/Moderate Plaque Psoriasis

A. At least 10% total BSA with some scalp involvement (15 evaluable subjects ages 7 to 11 years) or B. At least 3% total BSA with some scalp involvement (10 evaluable subjects ages 2 to 6 years). "Napkin" psoriasis (ie, psoriasis in the diaper area) can be included in the BSA calculation for this age group. Key Inclusion Criteria: * Male or female subjects, ages 2 to 11 years, inclusive, at the time of consent * For the maximum-use cohort: A. ISGA of 3 or higher at Screening (see Appendix 2). Ages 7 to 11 - at least 10% total BSA with some scalp involvement (See Appendix 1). Ages 2 to 6 - at least 3% total BSA (napkin psoriasis included) with some scalp involvement (See Appendix 1). -For the general use cohort, an ISGA score of 2 or 3 at Screening with no BSA minimum. Key Exclusion Criteria: * Any inflammatory skin disease in the treatment area that may confound the evaluation of the plaque psoriasis * Current diagnosis of unstable forms of psoriasis in the treatment area, including guttate, erythrodermic, exfoliative, or pustular psoriasis * Use of any topical treatments that have a known beneficial effect on psoriasis, including but not limited to corticosteroids, retinoids, vitamin D derivatives, coal tar, tazarotene, medicated shampoos, or anthralin, within 2 weeks prior to enrollment * Use of nonbiologic systemic antipsoriatic therapy (eg, corticosteroids, psoralen, retinoids, methotrexate, cyclosporine, other immunosuppressive agents), biologic therapy (eg, adalimumab, etanercept, golimumab, infliximab, ustekinumab), or phototherapy (eg, psoralen and ultraviolet A \[PUVA\], ultraviolet B \[UVB\]) within 4 weeks prior to enrollment * Use of or need for initiation of any nonpsoriatic therapy that might affect psoriasis (including antimalarials, β-blockers, interferon, or lithium) within 4 weeks prior to enrollment * Use of medications that affect or change calcium and parathyroid hormone (PTH) concentrations or interfere with the measurement of calcium or PTH concentrations within 4 weeks prior to enrollment * Known difficult venous access beyond that expected for subject age * Average daily ingestion of more than 2000 mg of elemental calcium or more than 1000 IU of vitamin D within 2 weeks prior to enrollment * History of hypersensitivity, known allergy, or other adverse reaction to calcipotriene or other vitamin D analogs or to any component of the study product * Current or past history of hypercalcemia, vitamin D toxicity, severe renal insufficiency, or severe hepatic disorders * Use of any investigational therapy within 4 weeks prior to enrollment * Pregnant or breast feeding female or females who do not use contraception * Current immunosuppression * Albumin-adjusted serum calcium at screening that is above the upper limit of normal