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en Assessment of Minimal Erythema Dose of Narrow Band Ultraviolet-B in a Sample of Iraqi Patients with Vitiligo and Psoriasis Aims: This study aimed to determine the minimal erythema dose in a group of patients with vitiligo and psoriasis from Iraq. Materials & Methods: This analytical cross-sectional study was conducted on 21 patients (13 females and 8 males, aged 9 to 60 years) with psoriasis and vitiligo who attended the Department of Dermatology at the Medical City Teaching Hospital, Baghdad, over a four-month period. Fifteen patients had vitiligo, while six had psoriasis. Skin type was III in 10 patients and IV in 11. A complete general, systemic, and dermatological examination was performed, including the number of depigmented macules, the site of involvement, and the approximate percentage of body surface area affected. Data were analyzed using Microsoft Office Excel 2010 with a two-tailed t-test. Findings: The minimal erythema dose ranged from 350 to 600mJ/cm². The mean minimal erythema dose was 448.1±87.6mJ/cm². There were no statistically significant differences between males (457.50±119.13mJ/cm²) and females (442.30±66.35mJ/cm²; p=0.710). Likewise, no significant difference was observed between patients with psoriasis (430.00±84.61mJ/cm²) and those with vitiligo (455.33±90.5mJ/cm²; p=0.563). In addition, there was no significant difference between patients with skin type III (447.00±89.69mJ/cm²) and skin type IV (449.09±89.93mJ/cm²; p=0.958). Conclusion: Gender, disease type (vitiligo or psoriasis), and skin types III and IV do not affect the minimal erythema dose. Vitiligo, Psoriasis, Erythema 399 405 http://ijwph.daneshafarand.org/browse.php?a_code=A-10-1-102&slc_lang=en&sid=3 Z.A. Rasheed 1003194753284600380387 1003194753284600380387 Yes Department of Physics, Faculty of Education, Al-Iraqia University, Baghdad, Iraq H.K. Ayyed 1003194753284600380388 1003194753284600380388 No Department of Physics, Faculty of Education, Al-Iraqia University, Baghdad, Iraq J.H. Taha 1003194753284600380389 1003194753284600380389 No Department of Physiology, Faculty of Medicine, Al-Nahrain University, Baghdad, Iraq