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Staphylococcus aureus is a type of bacteria that is commonly found on human skin. This bacterium is a part of the normal flora of the skin and mucous membranes, meaning it coexists with a healthy body without causing harm under normal conditions. However, it can become pathogenic and lead to infections when it enters the body through cuts or other breaches in the skin barrier.

Understanding the other options helps clarify why Staphylococcus aureus is the best choice. Escherichia coli is primarily associated with the gastrointestinal tract and is not typically found on the skin. Salmonella is also generally linked to gastrointestinal issues and is primarily found in contaminated food or water, rather than on human skin. Lactobacillus is a type of bacteria found in the human gut and in certain fermented products but is not prevalent on the skin either.

Thus, Staphylococcus aureus stands out as the correct answer due to its presence as a natural inhabitant of the skin's surface in healthy individuals.