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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
This can be due to the hyperpigmentation of chronic itchy rash.
Eczema can cuse this commonly.
Lichen simplex chronicus is the likely diagnosis.
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A potent steroid ointment should help over time to fade the brown pigmentation. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/