If you’re looking for the best moisturizer for dry itchy skin rash, then you need to make sure it’s free from chemicals, additives, preservatives, and cheap mineral oils. That’s what you would usually find in those inexpensive, drug-store type moisturizers. Why should you avoid these ingredients? Because these additives and oils can upset the natural pH balance of your skin. For healthy skin, the pH should be within the range of 4.2 to 6.5. A pH outside this range will upset the acid mantel. The acid mantel is very important to protect the skin from environmental factors like bacteria and skin diseases like eczema and psoriasis.