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Greetings,Thank you for your question.I will try my best to help you.I will answer in a moment/request for further information.
How old is he?
How is his body weight?
How is the size of red area?
I am writing the answer.
Thank you for your patience.
Thank you for the input.
I understand your concern.
I am very sorry for his symptoms.
Some local reaction can occur after vaccination.
Redness, swelling or tenderness can occur there.
It would gradually subside on their own.
If there is much blisters, I would advise to take an examination by doctor.
You can give him paracetamol if he feels pain.
I hope this information will be helpful.
If you have any query, please feel free to ask.
Your satisfaction is my goal.
Wish you a healthy life.Regards.
I have seen the pictures.
The blisters are quite many.
Please get him examined by doctor.