Hi. Thanks for your query. Read and understood your history and complaints. To recapitulate: male / 60 years- recently diagnosed diabetes on Metformin - develops soreness and enlargement of the right testis - going to PCP on Tuesday. he most probable cause of soreness and enlargement of right testis with diabetes can be Urinary tract infection going into the testis called Orchitis. I would advise you the following: -Urine culture and sensitivity should be done before the antibiotic is started to get an appropriate results. -Other tests of blood: CBC, urea, creatitnine, Blood sugar monitoring to keep diabetes under control. -Ultrasonography of the abdomen particularly for urinary tract, scrotum with color doppler mode. -A long course of an antibiotic to be started and changed as per the report of culture and sensitivity. -Scrotal support. -Plenty of oral fluids. -Not to hold urine to avoid retro-grade infection.