Your skin is amazing!
Your skin's microbiome is amazing. The bacteria that live on your skin protect it from many forms of damage from outer elements. This can include fighting free-radical damage and pollution, fighting harmful bacteria and substances by initiating an immune response or reaction or natural exfoliation, helping to clear away dead skin cells.
The picture shows on the left a swab I took of my face, just after getting up in the morning and the swab on the right is taken after washing my face with cleanser.