Dear friend Welcome to HCM Forum..
I read your queries and it seems that blisters on leg is not caused by chicken pox
because before it starts as blisters to spread it should present with continuos fever
and red spots in face and scalp
region and then spreading to neck..
So donot be panic as this blisters are due to alleric reaction or some superficial infection .
Also its better to avoid contact with chickenpox
affected person before you are immunised.
Hope this information is helpful.