I have some red bumps at the back my toungue, its not painfull but uncomfortable espeacialy when i swallow saliver.

Canker sores: No one knows exactly why canker sores occur, but they are often secondary to an infection somewhere else in your body, or to stress, or to eating too much spicy or acidic food. I prescribe a liquid concoction that my pharmacist compounds for me; your dermatologist probably has something similar. Prevention involves discovering the cause and eliminating it.

See you doc: The bumps you describe could be normal taste buds, however, should not cause any pain or discomfort. See you doctor.