The term microbiota thus refers to thecollection of non-pathogenic microorganisms (bacteria, fungi, viruses, parasites), known as commensals (bacteria that are beneficial to the body), housed in a specific environment, the microbiome. The human microbiota harbours millions of microorganisms. Within the body, there are different microbiotas: in the skin, mouth, vagina, male sexual organs, lungs, and so on.
Thanks to their antimicrobial properties, these "good" bacteria enable the body to protect and defend itself against invasive pathogens. Conversely, the "bad" bacteria invade the body and can damage cells and/or induce inflammation. However, they are also essential to our body, as they stimulate our immune defences. A healthy microbiota results from a balance between these "good" and "bad" bacteria. For instance, excessive use of antibacterial soaps can disrupt the skin microbiota, which can lead to redness and/or irritation; this is referred to as dysbiosis.
Note : The skin microbiome varies from one person to another. It depends on factors such as age, lifestyle, gender, skin pH, and so on...