First you should rule out all the treatable causes of frequent penile infection.
You are a diabetic patient, which is itself a risk if it's uncontrolled.
First test for
Diabetes control -
HBA1C, Fasting and 2h PP blood glucose,
Kindly describe what are the medicines you are taking?!
If required then go for circumcision procedure.
Next Steps
Kindly Connect for more details