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Background: Warts are tumors or growths caused by infection with Human Papilloma virus (HPV). More than 100 HPV subtypes are known. They are a common presenting disease in children and adolescents which spread by direct contact or autoinoculation. The aim of the Work: The aim of this work was to assess and compare the efficacy and safety of oral zinc sulphate and amino acids chelated zinc in treatment of viral warts. Patients and Methods: This cross sectional case control study included 60 patients with multiple viral warts who were collected from the Dermatology, STDs and Andrology outpatient clinic of Fayoum university hospital during the period from November 2014 to November 2015. The patients were 29 males and 31 females with ages ranging from 15 to 60 years. Results: There was statistically significant difference in degree of response in zinc and control groups as no patient in control group showed any response while in both zinc groups 27.5% of patients showed variable degrees of response. Also, there was no statistically significant difference in degree of response in both zinc groups. Conclusion: oral zinc in its both forms used in our study is safe but needs time to act and the response is not high, so it is not fit to be used as a monotherapy, but rather to be combined with other wart treatment modalities. Recommendations: More studies are needed to assess the therapeutic effect of zinc and its efficacy in combinations in warts treatment with higher doses and longer duration of treatment. [ABSTRACT FROM AUTHOR]

Background: Histamine was found to stimulate melanogenesis in cultured human melanocytes specifically mediated by histamine H 2 receptors via protein kinase A activation. Based on this finding, the effect of topically applied H 2 antagonist on UVB-irradiated Guinea pigs' skin was examined and found to be suppressive on the post-irradiation melanogenesis.Aims: In this study, we tried to explore the role of topically applied H 1 and H 2 receptor antagonists, in inhibition of UVB-induced melanization.Methods: The effect of topically applied H 1 and H 2 receptor antagonists in inhibition of melanization was done clinically and histochemically using Fontana Masson and DOPA reactions compared with placebo.Results: The post-irradiation pigmentation was found to be brownish/black instead of the original light brown color. This color change occurred below the shaved orange-red fur suggesting a switch of melanogenesis from pheomelanin to eumelanin. The induced pigmentation was suppressed by topically applied H 2 antagonist while both H 1 antagonist and vehicle had no effect. The microscopic examination showed that the keratinocytes in the H 2 antagonist-treated areas contained few melanosomes while the nearby dendrites are full of them.Conclusion: H 2 antagonists' inhibition of UVB-induced pigmentation is not only due to suppression of melanization but also due to a specific action on melanosomes' transfer. [ABSTRACT FROM AUTHOR]