My wife has a boil behind her back. sometimes, the boil will swell and contained pus. we think egg consumtion caused this. is it possible?

No: A boil is an infection from an organism on the skin. There are also glands that can become occluded and these sebaceous glands will drain a malodorous thick material but they are not always infected. See your doctor for treatment but not related to eggs.

It's a Myth: A boil is most of the time an infected cyst under the skin. It must be drained from all the pus under very clean ( aseptic) conditions, and most of the time needs an antibiotic to be taken . We are concerned about MRSA ( serious infection), so i recommend to be seen by a doctor , who will do the procedure in the office, under local anaeasthesia and probably take cultures of the wound if necessary.