On my scrotum there is what appears to be a puss-filled spot, although  its solid. There are one or two of these - close by there is a much larger blister like version that isnt white capped as if it had puss in. In no way does it seem to be connected to the testicle.
Hello, Please visit a general surgeon/urologist for the opinion. You may be having a sebaceous cyst on your scrotum area. This needs to be surgically removed. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.