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It looks like contact dermatitis.
Oak or poison ivy usually causes blisters though mild variation can occur.
You can give him zyrtec.
Hydrocortisone cream can be applied.
If you do not see any improvement or if there is worsening of the rash, please get him examined by doctor.
Sometimes, secondary infection can take place.
I hope this information will be helpful.
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Wish his healthy life.