Why does my cat lick and bite her front left paw whenever I pet her back?

She's done this for a while and still can't figure out why she does this. Any help would be appreciated :)

submitted by /u/Captain_Googlecrump
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from Pets https://www.reddit.com/r/Pets/comments/bmssfm/why_does_my_cat_lick_and_bite_her_front_left_paw/