Sore throat with red bumps in the back. ?

Dr. can check throat: New throat pain can be from a strep throat infection (antibiotics are needed), a cold or influenza (antibiotics usually not used), or from some other cause such as allergies or irritants. Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly (mainly to check for strep throat). A couple days of throat lozenges can help decrease throat pain.

Throat infection: May be the start of a throat infection - pharyngitis. Gargle with warm salt water. Drink plenty of water and rest. If not too serious should pass in a few days. Even mild cases of strep throat can self heal without antibiotics. If symptoms worsen or you are very concerned see your MD for an exam. https://en.wikipedia.org/wiki/Pharyngitis