An<unk>  is a collection of pus that has accumulated in a cavity formed by the tissue on the basis of an infectious process (usually caused by bacteria or parasites) or other foreign materials (e.g. splinters or bullet wounds). It is a defensive reaction of the tissue to prevent the spread of infectious materials to other parts of the body.
Cutaneous abscess
Cutaneous lymphoma
Pediculosis capitis
Gangrene 
Gangrene
Larva migrans
Dactylitis
Cutaneous larva migrans