I have a small red dot between the middle and tip of my tongue. and my tongue hurts. could the red dot be why it hurts or what could this be?

Can't see: Can't see the red dot or physically examine your tongue. Could be from getting cut on a crust of bread, or burning it with a hot pizza, or biting your tongue, or a myriad of other causes. Call your Dentist and make an appointment to be seen if you are concerned. If it's not gone in 10-14 days, make sure not to be seen ASAP.

Canker Sore: is the most common oral lesions. Individual ulcers typically last 1-2 weeks. The condition is usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned, see your dentist.