human skin flora showing microorganisms, pathogens and bacteria which naturally colonize the human skin -

microscopic disease closeup infection medicine macro microbiology skin germ organism microbe health hygiene microorganism bacteriology infected bacterial human growing symbiotic species flora allergen unhygienic tissue growth dermatological pore dermatology layer irritation treatment bacteria facial acne inflammation woman puberty beauty care face dermatitis magnification epidermis hyphen cutaneous surface barrier entering showing microorganisms pathogens naturally colonize