There is like a red pimple like bump under the toungue it doesn't hurt what could it be? it's in the middle of tounge towards the front.

Oral surgeon: Can't say without examining you. If it has been there for more than a few weeks, likely excision with biopsy will be necessary. See an oral surgeon

Lingual tonsils: What you are describing is lingual tonsils and they pose no harm and often go away on it's own. If concerned, see your dentist for consultation. Best of luck.

Salivary gland: There are 2 salivary glands under the tongue. Sometimes when you open your mouth to yawn you may have seen saliva squirt out of your mouth . these are the culprits doing that. They can get partially blocked, irritated, or sore, but usually resolve quickly. Take a look. If this persists, see the Oral Surgeon for examination and diagnosis and tx options. Good Luck.