Hi, As per your complain black patches on Tonsils are unusual finding. As you are diagnosed with strep throat already, black patches on Tonsils can be due to entrapped debris, secondary yeast infection, blood blisters etc. But for confirmation, a thorough clinical evaluation and investigation like throat swab culture has to be done to rule out the cause, and treatment can be done accordingly. As of now you can take a course of antibiotics like Azithromycin, anti inflammatory painkillers like Ibuprofen, do warm saline gargle and steam inhalation. Avoid spicy and hard foods and sip plenty of warm fluids. Hope this helps. Let me know if I can assist you further. Regards, Dr. Honey Arora