Ominous Blisters

Upon today's inspection, one of my sausages has a handful of watery (sometimes clear, and in one case cloudy) blisters. Another sausage has a couple of clear small, watery spots; and the third sausage has no blisters that I can detect. I'm definitely not eating the first one. I've included a few more pictures, again it's hard to see very clearly but note the raised area to the right of my finger in the first picture.