Sketchy mole on my arm?

so basically ive had this mole for ages now and all of a sudden it started to get itchy i started to itch it and then it turned red and really dark ( its located on my arm) i went to the doctors today and he said it was fine but he said it was fine before he examined it, and he went on to say it has no features of... show more so basically ive had this mole for ages now and all of a sudden it started to get itchy i started to itch it and then it turned red and really dark ( its located on my arm) i went to the doctors today and he said it was fine but he said it was fine before he examined it, and he went on to say it has no features of a cancerous mole, then when i came home i had a bath and i scratched it by accident and its hanging off what do i do?
Update: should i get another opinon
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