The back of my throat behind my tonsils have small whitish yellow bumps and my tonsils and back of mouth have small red veins everywhere. concerns?

See Doc!: You don't say if you have a sore throat or not. Regardles,s if this is new, you need to get seen. This could be strep throat and you need to be treated with antibiotics to avoid the chance of getting rheumatic fever. Also, strep throat goes away without antibiotics, but treatment is essential within about 10 days of onset of illness, so that rheumatic fever does not develop.

Difficult to tell: by only reading the description. Best to have exam by your physician, especially if you are experiencing symptoms (e.g., throat pain, fever, chills, pain with swallowing, etc.) to determine what the small bumps in the back of your mouth are and to evaluate the small red veins.

Tonsil stones: Your symptoms suggest tonsil stones, also called tonsilloliths or calculi. Or they may be concretions in the tonsillar crypts. Any throat sore throat symptoms? If so, you may use salt water gargles (1/2 tsp per 1 cup water) several time daily, or OTC sore throat lozenges. In themselves, these tonsil stones are not a concern, except that they may be a cause for halitosis. Hope that helps.