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Greetings,Thank you for your question.I am Dr. Su S.I will try my best to help you.
Thank you for waiting.It is not necessary to take him to ER.You can take him to doctor in the morning.It can be from an inflammation or irritation.
It would subside gradually.
I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish him healthy life.Regards.