How do I remove a like from a comment on Facebook?

To change your reaction to a post or comment, tap and hold your current reaction (next to Comment and Share), and then select a new one. To remove your reaction to a post or comment, tap your current reaction.

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Can I unlike a comment?

When the comments are displayed, the comment you previously “Liked” will be blue. To “Unlike” a comment, click on the thumbs-up “Like” icon. The comment “Like” icon will turn gray, confirming that you have now “Unliked” the comment.