Hi. Thanks for your query. Noted your history of feeling of pain in left testis. It started after you took 2 injections on left back continuously on two days...also left testis size is looking less compared to earlier. You have been taking antibiotics now but it does not seem to work. Whats the remedy ??? Injection on the back or buttock may not be related to the pain in the testis at all. The cause can be local and can be diagnosed by the following: - Clinical evaluation and examination by a General Surgeon or Urologist. - Ultrasound and color doppler studies of scrotum and the abdomen. - Continue antibiotics and ask your Doctors to ass on good anti-inflammatory medicine. - Give scrotal support. - Tests of blood and urine. Further treatment as per the findings.