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Hello Anon

Thank you for writing.

You may have an infection in your finger, or even a repetitive use injury like carpal tunnel. You may also have something called Achenbach Syndrome (something I also have) - you can read about this here (cut and paste): https://www.empowher.com/skin-hair-amp-nails/content/mystery-purple-finger-what-could-have-caused-it

You will need to consult your doctor for a proper diagnosis.
Best,
Susan