cross section of skin ph level balance on white background.

skin ph balance barrier level scale layer moisture hydration dehydration dry sebum moisturize mechanism cross acid mantle ceramides value uv rays irritants allergens microbial organisms microbes microbiome disrupt healthy ultraviolet vector flat design infographic dermatology surface sebaceous glands water retain cell corneocyte lipid complexion acidic alkaline base absorption factors harsh cleansers aging condition damage