Welcome to HCM.
There are many conditions like epididymal cyst
,beginning of vericocele,hydrocele
You need to get a scrotal ultrasound
, which will take you less time than googling or visiting a bunch of sites. The ultrasound is the only conclusive method, it is quick and painless as well as being non-invasive.
FNAC (fine needle aspiration biopsy
) also will be helpful to rule out the diagnosis.
Consult surgeon for diagnosis and better medical management.