الفهرس 
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Abstract
Scalp is the most frequent site of involvement in chronic stationary psoriasis and seborrheic dermatitis. Psoriasis is a chronic inflammatory, erythematosquamous, immune mediated dermatitis. Scalp involvement ranges from mild lesion with minimal scaling to sever forms associated with thick crusted plaques.
Seborrheic dermatitis is a common, chronic inflammatory, relapsing disease. It has distinct characteristics depending on the age group affected. In infancy, SD characterized by the appearance of yellowish adherent scales of varying extent adherent to the scalp that appears shortly after birth. In adults, the lesions consist of erythematous macules or thin plaques with poor-defined borders associated with fine, dry white or even moist or oily, yellowish scales. Both diseases run through a chronic course.
The current study was conducted on 22 patients, 10 patients with scalp psoriasis and the other 12 with Seborrheic dermatitis . Cases were selected from those attending the out patients’ Dermatology clinic at Al-Minia University Hospital. Written informed consent was taken from all participating patients or their parents.
By analysis of the data collected from patients with SP the majority of patients were between 40-65 years 70% and only 30% of patients were below the age of 40 years.
The evaluation of history and clinical examination revealed that the disease presented in 2 patients with positive family history. Ten percent (10%) of our patients have arthritis and (20%) have IHD. In this study (40%) of patients had stressful events prior to the onset of the disease Nail involvement is present in (30%) of patients.
By analysis of the data collected from SD patients included in the current study, we found that the majority of patients were between 18-45 years (66.7 %) and (33.3 %) above the age of 45 years. 7 patients are males (58.3%) and 5 are females (41.7%).
The evaluation of history and clinical examination revealed that the disease presented in 3 patients with positive family history and in 2 patients with diabetes mellitus.