The blisters are a concern here. There is something wrong. A good direct visualization of the blisters would help in confirming the cause.
Please apply calamine
lotion to the affected areas, so that they do not increase in size and number and it soothes the lesions.
In my opinion, you need a good topical antibiotic
cream like soframycin
and oral anti-histamines like Fexofenadine
for some days.
I wish you recover quickly.