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.