What causes branchial sinus infection?

Answer 1

If I'm reading you right, you mean an infection caused by an infected cyst. A branchial cleft cyst is a birth defect found in the neck or just below the collarbone that may be visible as a pit or lump. These branchial cleft cysts appear when the tissue of the branchial cleft (the area in the neck & collarbone) fail to develop normally and open spaces, called sinuses, may remain on one or both sides of the neck. A cyst may form from fluid drained from one of the sinuses and the cysts or sinus becomes infected.

Infected branchial cleft cysts or sinuses need antibiotic treatment and if problems persist or recur, the cyst can be surgically removed.

Answer 2

Everyone has sinuses, hundreds of them. They warm the face, the air you breathe, etc. I also have asthma. Bronchial asthma, it's seasonal. At times it becomes infected. The "snots" for a better word, are clear all the time, they all of a sudden become cloudy and green. I know they are becoming infected, I head to the doctor for a shot of anti-biotic. I may or may not get miserable before the antibiotics kick in. I may have to go on my nebulizer so I can breathe easier. The sinuses are swelling and making my bronchial tubes harder to breathe through. Along with this, the asthma is now working, the two of them are making me miserable. Until the anti-biotic work, and the nebulizer helps I don't want to even speak with people, it's like a bad cold.