Interdigital psoriasis (psoriasis alba) is atypical and rare form of psoriasis that is often missed as it is commonly mistaken for either dermatoses or fungal infection.In this study we observed and analyzed the prevalence of psoriasis interdigital of palms and soles and brought medical awareness to dermatologists and family doctors this rare form of psoriasis. Thus, you can help to avoid mistaken diagnosis and the start of correct treatment as soon as possible.

Hospitalized patients and outpatient clinic will be included in the study after receiving the signature of a inform consent.Patients groups : 100 patients with psoriasis,100 patients with atopic dermatitis and 100 healthy patients (control group).Patients with atopic dermatitis will be the secondary control group.Patients diagnosed with inflammatory condition of interdigital skin of the palms and soles will be checked by fungal microscopy test.If the fungal test is negative ,we need to prepare to a biopsy of the skin in this area .Following results of the skin biopsy conclusions can be shown about the prevalence of interdigital psoriasis in psoriatic patients enabling suitable treatment to be given to the patients.

Inclusion Criteria:

• patients above 18 years old ,hebrew speakers, patients with psoriasis vulgaris or atopic dermatitis without systemic treatment

Exclusion Criteria:

• patients below 18 years old, pregnancy women, patients treated with systemic agents for psoriasis or atopic dermatitis(methotrexate,cyclosporin,neotigason)

patients of dermatology depatment and outpatient clinic in the hospital