to me it looks like the snake is about to shed, and there is just some moisture under the old layer of skin(between the new on), kind of like how we get blisters. when i soak my BD when she's shedding(gets soaked 2 times a week no matter what) some water gets under the new layer and makes like little "water pockets" until she sheds.
wow sorry didnt even look at the bottom of the pic, i would say that looks like a burn that is blistering up badly. what is your fiends set up like.