Scleritis (inflammation of sclera) is a strong indication of the underlying medical problem. It can be due to fungal, viral or parasitic infection, trauma, exposure to chemicals, poisonous gases or due to post-surgical complications.
Mast cells are granulated cells typically found in connective tissue. These cells mediate immune responses to foreign particles. In particular, they release large amounts of histamine and enzymes in response to antigen recognition.
Characteristic connective tissue cell types include both resident cells and immigrant or wandering cells. Resident cells are: Fibroblasts (which secrete the fibers and ground substance of the extracellular matrix). Adipocytes (which store fat). Mast cells (which trigger inflammation).