What is a cold abscess?

Usually in people who are immunosuppressed (eg: takes corticosteroids, or leaving HIV untreated) he will have an infection with staphylococcus. The destruction will happen because the bacteria is destructive (it will destroy the tissue) but to the outside world, the body (inflammatory response) is not strong enough to show me how bad the situation is. It is cold because it looks less inflamed, no puss, no warmth