Are you sure it is keratosis pilaris because usually it doesn;t leave brown spots. However, It is normal for red lesions to pass by a phase in which they get brown during healing. If this doesn't resolve alone within few months there are several depigmenting treatment that can be used depending on the aspect and the baseline color of the skin
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.