Читать книгу pH of the Skin: Issues and Challenges - Группа авторов - Страница 41

Many endogenous physiological, exogenous and environmental factors influence skin surface pH (Table 1, Biro, in this volume). Published literature on these factors has been evaluated by numerous publications in the past 15 years [2, 4, 7, 9–12] and should be consulted for extensive explanation of each factor. In brief, skin surface pH differs with age, anatomical position, circadian rhythm, the amount of sebum on the skin, skin moisture and sweating (caused by exertion/exercise). Skin diseases such as atopic dermatitis [4], ichthyosis [4], irritant contact dermatitis [12] and psoriasis [9] have been shown to alter skin surface pH (Danby and Cork, as well as Bigliardi, in this volume). The influence of ethnicity, gender and skin temperature is inconclusive, with some studies reporting an influence and others not.

Many exogenous factors such as occluded skin, exposure to skin irritants such as soaps and detergents, application of cosmetic products and skin washing affect skin pH. The influence of environmental season and temperature on skin pH appears inconclusive.