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Psoriasis is not just a skin condition. It is estimated that nearly 125 million people worldwide have psoriasis. In recent years, the link between the microbiome and psoriasis has been increasingly recognised.

The human skin is home to a multitude of commensal microorganisms (bacteria, fungi, viruses, parasites) that make up the skin microbiome. This collection of microorganisms interacts with skin cells and immune system cells to maintain skin homeostasis. At the same time, the human skin and its microbiome are subject to external and environmental stressors, such as ultraviolet light (UV).