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Healthy bathing habits can be helpful for eczema
Proper bathing routines are very important in maintaining skin hydration, decreasing infections, and preventing eczema (atopic dermatitis) outbreaks.[1] Bathing, followed by moisturizer application, can increase skin hydration in people with eczema, while bathing without the use of moisturizer decreases skin hydration.[2]
Researchers have found that the frequency of bathing, whether it is once daily or twice weekly, does not affect the severity of eczema. In other words, decreasing bathing frequency to longer than once daily will not help improve eczema. The duration of bathing, on the other hand, can have significant effects on eczema. Long baths (20-30 minutes) worsen eczema when compared to shorter baths (10-20 minutes).[3] Repeated washing with soaps can damage the skin’s acidic protective barrier by removing the skin’s natural oils and leads to drying.[4]
Bathing is useful for both cleansing and hydrating the skin when done properly. Water helps to hydrate and soften the top layer of the skin so topical medications and moisturizers can get absorbed more readily. Cleansers can remove irritants, including bacteria, sweat, and dust off of the skin.[2] Research has found that when people with eczema follow a bathing routine by bathing once daily with mildly acidic cleansers and using a moisturizer after they bathe, they see improvements in their eczema, itching, and sleep.
Bathing depletes skin proteins and water-retaining fat within the skin’s protective layer. Water removes the natural layer of fat on the skin and changes the skin to a more basic pH, both of which can be harmful to our skin. If a moisturizer is not used after bathing, water evaporates from the skin and the skin becomes dry and itchy. [5]
Our skin surface (pH 4-5.5) is much more acidic than soap (pH 9-10.5). Traditional soaps have a more basic pH and can be irritating to the skin. Basic soaps also destroy enzymes that make and repair the skin’s protective barrier. Research has shown that soaps with higher pH (7.5) have a greater drying effect on the skin than a cleanser with a lower pH (4.5) that is closer to the pH of skin. Mild or “non-soap” cleansers with an acidic pH (5.5-6.0) should be used for cleansing because neutral or alkalotic soaps can cause eczema outbreaks and disrupt the function of the skin barrier.[6] Unless the body has visible dirt on it, cleansers should only be used on the armpits and groin. Also avoid soaps that contain alcohol, dye, and fragrance, as these chemicals can be irritating to the skin.
Need a resource for patients and parents? Check out: Integrative Approaches to Eczema eBook Series.