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Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
You are right that it is not a normal behavior.
You have explained it thoroughly.
As a nurse you can have a watch and see whether he repeats it or not.
If you suspect that he is continuing, then you should consult a pediatric psychologist.
I hope this information will be helpful.
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Wish him healthy life.
It can be that he has seen in the TV or heard from friend.
Abuse is a possibility as you know.
If he has itching from pinworm, he can put fingers there.
It is not completely abnormal but it can happen.
We should search for the reason for such activity.