I have a bump on my wrist, how do I know what it is?

There is a bump on my wrist to the left hand side. Being in the top right, It looks as some sort of bullseye (not a tick bite) which is red and white in the middle... possibly a cyst. It is a small bump that is not even close to a size of an inch. This does not hurt, can I please get an answer to what this is?
Asked Mar 21, 2017
Edited Mar 21, 2017

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