Doctors in the house pls kindly help me out have being having white patches on my tongue for quite some days now and i dont know the causes but when i checked online i saw that it was as a result of overuse of antibiotics or when one has chlamydia,gonorrhea or hiv but due to the fear i went for my hiv test and it came out negative although i only had sex once in my life...pls can anyone tell me the reaaon for it