Hi, thanks for using Health Care magic,
I had gone through your question and understand your feelings,
according to your symptoms...it is not correct.
So my opinion is that you should not worry about this, unless the diagnosis is 
confirmed...ok
I had number of similar cases like you in my clinic,
If I were your treating doctor, I would suggest first clarify your doubt by doing HAIR MINERAL ANALYSIS, It can determine  any heavy 
metal poisoning in your body.
According to your symptoms, itching and bumps at testicle area...
may be due to other problem ...first ruled out 
diabetes by doing investigations like
Blood 
glucose levels fasting and post prandial...meet the local doctor and confirm
the diagnosis. wish you good health..