Dermatitis: There are various kinds. Sometimes something is irritating. At age 9 eczema is common. Especially if you have brown or black skin you will notice darker skin wherever you are rubbing or scratching. this is post-inflammatory hyperpigmentation. You will do best with a prescription cortisone cream. Meanwhile you can try OTC hydrocortisone cream. A dermatologist will help you.
Answered 8/7/2014
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