Hi. There needs to be a detailed history about the rashes you're mentioning or a good image of the same. If skin on the neck is black a possibility of a condition known as acanthosis nigricans may exist but again after closer look and a detailed history. I'd suggest you to consult a nearby dermatologist.
Regards,
Dr. Zubin Mandlewala
MUMBAI
Answered2016-06-20 17:38:51
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