Blisters often form on the skin and most patients ignore them. Some think they were burned, or suffered some type of quick injury that resulted in a blister developing, and continue about their day as if it is nothing to be concerned about. That would be totally acceptable if it was just a mere blister, but many cases these can be warning signs of allergens being problematic internally.
Blisters are a commonality for those living with a latex allergy, often for those that work in the healthcare industry. Working with your hands all day long helping others can lead to lots of bumps, aches, and blisters which is why so many don't even think twice about it when one develops. If you start noticing one here and there, and are routinely exposed to latex items, it's worth having it checked out.