Our skin possesses a protective water-lipid barrier, which comprises secretions from both the sebaceous and sweat glands. This barrier is home to skin-related microorganisms that defend against infections — and they thrive in an acidic environment!
The skin's acidity level varies across its surface but plays a pivotal role in upholding the protective barrier's function. Ranging from a pH of 7.0 in the skin's deeper layers to about 4.5 in the sebum, it's essential for all skin processes to function optimally. This balanced acidity is key to shielding the skin from infections.
For people with atopic dermatitis, this balance is especially crucial. The condition alters the skin's acid-base equilibrium, leading to symptoms like dryness and flaking. An alkaline environment not only promotes the growth of harmful bacteria, such as Staphylococcus aureus, but also diminishes beneficial microorganisms. Therefore, it's advisable to cleanse such skin using products specifically formulated with a slightly acidic pH, ideally between 5.0 and 5.5. This includes soaps, shower gels, foams, and shampoos.
It's worth noting that traditional solid bar soaps typically have a pH ranging from 7.0 to 9.0. Hence, dermatologists and cosmetologists often suggest liquid cleansers for problematic skin. Additionally, gynecologists recommend specialized products with an even lower pH (around 3.5-4.5) for feminine intimate hygiene