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Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
I am sorry for your problem.
You need not to worry.
Shingles is contagious when there is contact with the fluid of the blister.
You do not have blisters & it is not certain that you have shingles also.
The boy is likely to be vaccinated against chicken pox.
That would protect him too.
There should not be any risk of transmission.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish your healthy life.