Term	Definition
16S rRNA gene sequencing	Genomic analysis of 16S ribosomal RNA phylotypes from DNA that is extracted directly from bacterial communities in clinical or environmental samples, a process that circumvents culturing [29].
Skin microbiota	Total of microbes in/on our skin [168].
Microbiota	The group of microbes found in/on a specific environment or living host [169].
Microbial diversity	Degree of variability of the microbiota. α-diversity describes within-sample variability, while β-diversity signifies variability between samples [169].
Dysbiosis	Microbial imbalance or maladaptation [168].
Prebiotics	Nutrients that stimulate beneficial skin microorganisms [170].
Probiotics	Live microorganisms that have a favorable impact on host health when given in proper amounts [169].
Antibiotics	Antibiotics block the growth of or destroy bacteria and other microbes [168].