One of the thoughts that occur to me based on this information is a disease process called shingles
. Shingles is a virus that is caused by the same virus as chickenpox
. It occurs along a nerve
where the chickenpox virus lurks.
So, first, has your husband had the chickenpox as a child?
Because the virus remains with us, hiding out in the nerves; an occurence could feel like a "bite". The areas could also itch. Blisters are common.
Few insect bites
cause "blisters". In any case, a physician would be required to diagnose the problem.