where do the resident microorganisms reside in the skin
Skin flora Many of them are bacteria of which there are around 1000 species upon human skin from 19 phyla.[1][2] Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.
Sebaceous gland Sebaceous glands are part of the body's integumentary system and serve to protect the body against germs. Sebaceous glands secrete acids that form the acid mantle. This is a very fine, slightly acidic film on the surface of the skin that acts as a barrier to bacteria, viruses, and other potential contaminants that might penetrate the skin.[18] The pH of the skin is between 4.5 and 6.2,[19] and this acidity helps to neutralise the primarily alkaline nature of contaminants.[20]