By your description it sounds that the lesions may be acneiform in nature, and thus may represent folliculitis
given the location; some of those lesions can be bigger and generate furuncules (small abcess with pus). They may or not be related to your sore throat; for example, Strep is a bacteria that can give both sore throat and skin lesions. The best course of action is for your to be seen. probably in Express Care, to determine if you need antibiotics or not.
Dr Brenes-Salazar MD
Mayo Clinic MN