The purpose of this study is to evaluate the anti-psoriatic effect of LEO 90100 aerosol foam compared with Betesil® medicated plaster

The products will be applied on 6 test sites (each product on 3 test sites) once daily 6 days a week (except Sundays) for 4 weeks. The application sites for each product will be determined according to random assignment. Depending on the size of the psoriasis plaques, 2 or 4 test sites will be located within the same plaque; the treatment assignment will be done pair-wise.

Inclusion Criteria:

• Signed and dated informed consent has been obtained

• Subjects with a diagnosis of psoriasis vulgaris with preferably three lesions (plaques) located on arms, legs and/or trunk or at least two lesions (plaques) located on arms, legs and/or trunk. For subjects with three lesions, each lesion must have a size suitable to accommodate 2 test sites (test site area 5 cm2, distance between two test sites at least 2 cm). For subjects with two lesions, one lesion must have a size suitable to accommodate 4 test sites, and the other lesion must accommodate 2 test sites.

• Age 18 years or above

• Outpatients

• Female subjects must be of either

  • non-childbearing potential, i.e. post-menopausal or have a confirmed clinical history of sterility (e.g. the subject is without a uterus or has tubal ligation) or,
  • child-bearing potential provided there is a confirmed negative pregnancy test prior to trial treatment to rule out pregnancy.

Exclusion Criteria:

• Female subjects who are breast feeding

• Systemic treatment with biological therapies, whether marketed or not, with a possible effect on psoriasis vulgaris within the following time periods prior to randomisation:

  • Etanercept - within 4 weeks prior to randomisation and during the trial
  • Adalimumab, infliximab - within 8 weeks prior to randomisation and during the trial
  • Ustekinumab - within 16 weeks prior to randomisation and during the trial
  • Other products - within 4 weeks/5 half-lives prior to randomisation and during the trial (whichever is longer)

• Systemic treatment with all other therapies than biologicals, with a potential effect on psoriasis vulgaris (e.g., corticosteroids, retinoids, immunosuppressants) within the 4-week period prior to randomisation and during the trial

• Subjects using phototherapy within the following time periods prior to randomisation and during the trial:

  • PUVA: 4 weeks
  • UVB: 2 weeks

• Subjects using one of the following topical drugs for the treatment of psoriasis within the 4 week period prior to randomisation and during the trial:

  • Potent or very potent (WHO group III-IV) corticosteroids

• Subjects using one of the following topical drugs for the treatment of psoriasis within 2 weeks prior to randomisation and during the trial:

  • WHO group I-II corticosteroids (except if used for treatment of scalp and/or facial psoriasis)
  • Topical retinoids, Vitamin D analogues, Topical immunomodulators (e.g. calcineurin inhibitors), Tar products, Salicylic acid

• Subjects using emollients on the selected plaques within 1 week before randomisation and during the trial

• Initiation of, or expected changes to concomitant medication that may affect psoriasis vulgaris (e.g., beta blockers, antimalarial drugs, lithium and ACE inhibitors) within 2 weeks prior to the randomisation and during the trial

• Subjects with current diagnosis of guttate, erythrodermic, exfoliative or pustular psoriasis

35 subjects from 1 centre in France were enrolled into the trial. The first subject was enrolled on 22-Sep-2015 and the last subject completed the trial (last visit, including follow-up) on 07-Dec-2015.

From signed Informed consent form (Day -28 to -1) to end of Follow-up (Day 43 +/-2).