After recently getting a check up at my GUM clinic they found numerous puss cells on the opening of my uterus... alot in fact. I have been with my partner for 3 years now and on my last examination (approximately 5 months ago) there were no signs of puss cells. Is it possible for puss cells to appear of there own accord or does this mean that he has been unfaithful and brought the bacteria into the relationship. Any advice would be much appreciated. Thankyou.