The kind of bite that causes a small row of blisters come from bed bugs. Regular vacuuming of the mattress and bed frame as well as changing the bedding frequently can eradicate a bed bug problem.
Any spider bite can do that.
A spider bite :0
If you are fighting a virus or if you have a cold you might get a fever blister.
No matter what type of insect bite it is - if it is covered by a blister that would indicate that it is a slightly more serious than normal insect bite - and you MUST NOT rupture or puncture the blister for risk of infection.
Bed bug and spider bites usually starts as small bumps and then forms into blisters. However, the way you describe it sounds as if it may be an ulcerated bite - that should be seen by a doctor.
Pemphigus vulgaris is a specific kind of autoimmune disease that causes skin blisters. It is hereditary.
These bactera are: Streptobaccilus moniliformis and Spirillum minus.
Redness with blisters is considered a 2nd Degree Burn.
Excema
The termites than fly around looking to start new colonies do not. The soldier termites and the worker termites can bite, but do so only in defense, and they have no venom. It's unless you'll get bite unless you are disturbing a colony with your bare hands.
A turpin watch out they bite!
You can try insoles, but to be honest, any kind of sports shoes that are too big or small should not be worn because they will hurt you and cause blisters etc.