What is the difference between an abscess and a mast cell tumor?

One is a neoplasm: An abscess is a cavity that contains pus. It indicates a soft tissue infections that got encapsulated (contained) and now it is a sphere that has pus ( bacteria and dead cells,...) Mast cell tumor is a rare tumor (neoplasm) generally malignant that originates in mast cells .. Mast cell tumors are more common in Dogs in the skin, than in humans. Mast cells release histamine

Quite different: Mast cell tumors are rare malignancies that originate in the skin. Abscesses are common, basically pus pockets due to infection. Abscesses are treated by incision and drainage, sometimes along with antibiotics. Mast cell tumors are surgically removed. Chemotherapy may be used if the tumor recurs.