This is an odd case involving a cow:

First, the cow had Fool (Foot rot), was treated and healed. But few days after that the leg got inflammed with huge pain.

As you may see in the pics, when Miguel put a needle a semitransparent (nearly yellow) liquid appears with pressure without detectable smell. After that, swelling and pain decrease.

Question: Could it be an antibiotic accumulation? Or maybe a leak of synovial fluid?