A<unk>  is an aggregation of macrophages that forms in response to chronic inflammation. This occurs when the immune system attempts to isolate foreign substances that it is otherwise unable to eliminate. Such substances include infectious organisms including bacteria and fungi, as well as other materials such as foreign objects, keratin, and suture fragments.
Granuloma
Tonsil stones
Acanthoma
Follicular hyperplasia
Pseudopolyps
Enema
Perifolliculitis
Keratin pearl