large skin blisters on swine
We have about 40 swine on our farm, including 31 piglets that were born at the end of February. Several of the piglets and one of our 9-month-old gilts has developed rather large "blisters" or fluid-filled pockets on their skin. The blisters are located on the hindquarters or side/rear of the belly area. Each affected pig has only one of these. I have lanced and drained them on a couple of the pigs. The pocket contains a watery, someone yellowish fluid(in a couple, slightly tinged with blood). Within a day or two of lancing, the blister refills with the fluid. There are no other symptoms, and all of the pigs seem happy and healthy. What is this, and what can we do to treat it?
Most likely seromas due to trauma. When lancing the opening needs to be large enough to remain open (clean daily) until the inside heals.