That's a species of commensal bacteria, which basically means it's friendly.

这是一种共生细菌，也就意味着它本质上是友好的。

The commensal bacteria that make up your microbiome probably even help prevent other, more harmful bacteria from colonizing on your skin.

这种共生细菌是人体菌群的一部分，也许还可以帮助防止其他更有害的细菌在皮肤上繁殖。

Now, this news may make you recoil in horror, but thankfully they are commensal species, which means that whilst they benefit from us, they are completely harmless.

现在，这个消息可能会让你害怕，但谢天谢地，它们是共生物种，这意味着虽然它们从我们身上受益，但它们是完全无害的。