Cysts can arise through a variety of processes in the body, including.  1 wear and tear or simple obstructions to the flow of fluid, 2  infections, 3  tumors, 4  chronic inflammatory conditions, 5  genetic (inherited) conditions,  defects in developing organs in the embryo.
1 Acute * sinusitis often develops after a person has had a cold, with symptoms lasting less than 3 weeks. 2  Chronic * sinusitis can last 3 to 8 weeks or longer; it often occurs in people who have allergies or asthma. 3  Recurrent sinusitis consists of several acute episodes of sinusitis in 1 year.
How Long Is a Staph Infection Contagious? Staph bacteria are frequently present in healthy humans. Areas where the bacteria can be found include the sebaceous (sweat) glands, nose, and other skin areas. Because of this colonization of healthy people, it is almost impossible to prevent contact with the bacteria.