The cause of spongiotic dermatitis is generally a irritating substance. For example, insect bite, cosmetics, food causing allergy, detergent or soap may cause spongiotic dermatits.
Except this, if you are suspicious about a substance or some food, it is better to stay away from it. During this time, you can figure out whether your suspicion is right or not by checking the symptoms are diminishing.
Don’t take too hot shower. Hot water dries the skin. This may worsen spongiotic dermatitis.
Detergents including sensitive ingredients and soaps may harm your skin in the same way.
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Wishing you joy and healing.