Thank you for your query at AskTheDoctor.com
I understand your concern.
You need to get yourself evaluated as soon as possible because numbness in the penile head is not related to the laparoscopic appendectomy that you had. It can only happen ( rare possibility ) if a nerve is injured during the surgery but with a laparoscopic approach, chances of that happening is very low.
So you need to get yourself examined as soon as possible. I don't want to scare you, but this is the best I can suggest you at the moment.
Hope this was helpful,
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