The rash that is worsened by dust mites is eczema or atopic dermatitis. Dust mites don't cause it but can certainly cause flares of the disease.
Atopic dermatitis consists of red, scaling, sometimes weeping or oozing plaques or patches on the skin. It may involve any area of the skin but in adults tends to localize to the crooks of the elbows and knees, the eyelids and hands. It may also be wide-spread and involve most of the skin surface. The rash is very itchy.
Dust mites often live in carpeting, so one thing to do is to get rid of carpeting and just have wood floors. The pillows, blankets and mattresses need special covers that don't let dust mites through.
Eczema/atopic dermatitis usually requires prescription medications like prescription-strength cortisones, but will be greatly helped by washing with a very mild soap or soapless cleaners, using warm, not hot water, stopping the use of washcloths, sponges, loofahs or anything that scrubs the skin, and applying a fragrance-free, dye-free moisturizing cream immediately after blotting yourself dry.
Eczema can also be infected from scratching. I recommend seeing your dermatologist to a thorough evaluation and treatment of the rash.
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