Function of skin ? Prevents excessive water loss ? Regulates temperature ? Involved in sensory phenomena ? Assists in vitamin D formation ? Barriers against microbial invades Two layers ? Dermis and epidermis. Skin Microbiota ? Normally harmless ? Compete with pathogens ? Cleansing cannot completely remove it. ? Grows on moist areas of skin ? Made up of yeast, Malassezia, bacteria. May produce disease.