Sore throat with green and brown patches reoccurred twice now, and doctors i've seen aren't too concerned. accompanied with sniffles. ?

Infection?: Green patches with sore throat makes me think infection of sinuses. Brown patches? Kinda makes me wonder if you smoke, first of all. No judgment...it is just usually why I see brown there. If u have other signs of infection (slight fever, swollen lymph nodes in neck, etc) I'd see if an antibiotic helps. It should also be possible to send a swab of the lesions to check for bacteria. Hope it helps!