Hello! i recently have had drainage running down my throat the past week and now have three white sores appear in the back of my throat. any idea of what it could be?

Post nasal drainage: Typically, Post Nasal Drainage (PND) is either allergic or viral in origin. In most cases conservative treatment with a mucolytic medicine or antihistamine will help. The white areas - depending on where they are - might be small viral ulcers, tonsil debris or inflammatation. Worsening of symptoms like sore throat associated with fever, chills, fatigue,etc would warrant further investigation.