Unfortunately the picture is not enough to identify the cause of your rash. You need to have a history of illness taken as well as an examination including touching of the lesion to assess its depth and maybe some tests in case the cause is not clear upon examination and history.
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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.