Abstract: Micrococcus is catalase positive, coagulase-negative, and gram-positive cocci spherical. Micrococcus is saprophytic bacteria which are parasitic on human skin, pharyngeal and so on. They are harmless to the human body. It is recognized that micrococcus species can be opportunistic pathogens in immunocompromised patients, and can also cause a series of skin diseases.

Key words: micrococcus, opportunistic infection, vitiligo, sensitive skin syndrome, pitted keratolysis, melasma