How do I heal the blister-like things on my finger from plucking my violin strings?

Will it go away soon? How much longer? I'm a beginner violinist and the beginning of my book, you have to pluck the strings before you use the bow. How can I heal (or prevent) the blister thingy?
Update: Yeah... I don't have a teacher by the way, my parents don't want to pay for lessons :/
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