Bizarre Blister Story

I went to a local batting cage last week to take my first cuts of the off-season. Twenty minutes later I pulled off my left batting glove to take a look at the blister that I knew had formed on the inner part of my left thumb. What I saw surprised me:

Take a closer look at the picture and you might be able to spot something abnormal besides the red blister. Well, two things: uncommonly dry skin, as well as a secondary blister type thing on the top of my thumb! Like the noticeable red blister, it is roughly the same size and has the same squishiness feeling when poked.

Unlike the red one however, I have no feeling from it as I touch it -- nor did I feel any pain or discomfort in the area whilst batting. As there is no rub of anything to the back of my thumb during the batting motion, I am extremely curious as to how something like this was created; so curious that I want to share this with all of you and see if anyone out there can make any sort of diagnoses. As I have a bad habit of carefully puncturing blisters and excising the flap of skin away, I can confirm that this secondary phenomena reacted the same way a normal blister would under such trauma. While not on par with those seen on House, I think this certainly qualifies as a genuine medical mystery.