Blue Nevus fell off, i'm affraid

Hi there, i have a small blue mole on wrist for more than 10 years. i've noticed a few days ago that it has dried up... It became darker, then yesterday it started peeling off... It is a small dried scab... And underneath, my skin is clearer, pearly, but i still can see my blue mole. it didn't bled, it's not itchy... Of course, im a little bit worried... (btw, size didn't change) the first pictures is with the scab, the second one is without... What fo you think ?

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I think you should get it biopsied. Any changes to a blue mole need to be investigated. If you are in UK see your GP.If you are in a country where you self refer to consultants then see a dermatologist.
It looks slightly odd.