Looks like an abscess to me. It may not be ready yet to lance. Wait a week or so.
If your vet lances it ask them if a culture/sensitivity may be of value.
Hi, do you mean a cultural or sensitive way to lance?
Hi, do you mean a cultural or sensitive way to lance?
The vet would take a sample of any fluid. Look under the microscope for cells and organisms then culture for bacterial growth and what antibiotic would be most suitable and safest.