<unk>  is defined as collection of pus in a specific<unk> rt of body.<unk>  can form in any tissues secondary to initial inflammation or trauma. Skin is the most common site for<unk>  formation.<unk>  may be classified based on<unk> thogen.<unk> thogen is varied depending on<unk> ' location however, Staphylococcus aureus is the leading cause of<unk> es. Secondary to local inflammation and cytokine release, polymorphonuclear cells (PMNs) are the first and the most important responding cells in<unk>  formation. Neutrophils, are responsible for phagocytosis. Once the<unk> thogen is opsonized by complement system, it will be recognized by neutrophils and the phagocytosis process will begin. After phagocytosis the bactricidal process will begin by producing superoxide radicals and other reactive oxygen species (ROS). Conditions that may result in immunosuppresion, such as chronic steroid therapy, chemotherapy, diabetes, cancer, and AIDS are predisposing factors for<unk>  formation. Diagnosis is based on clinical features, laboratory, and imaging findings. Treatment depends on location and etiology and it is mostly drainage and antibiotics.
Abscess
Thrombus
Detritus
Phlegmon
Adhesion 
Hernia
Bone or cartilage mass
Lesion