I've been unable to keep food down for the past 48 hours, about 5 hours ago, I was able to eat food and keep it down for the first time. I've experienced no symptoms, except also noticing a white bump appear on my lower lip on the inside. I just noticed it about the time I was able to keep food down. I have not been sexually active in 6 months. I've given blood to the Red Cross and Had multiple blood tests done for a Upper Respiratory Tract Infection I had in Semptember. I also was admited to the hospital in September for a Lactose Intolerance Problem, and they took my blood then also. So far, I've never been told I have any STD of any kind. What could be this white bump?