There can be various causes for a nodule or lump in testis including cancer.
is the most common form of cancer in young men, mostly between the ages of 15 and 44. Since 1975, the incidence of testicular cancer has more than doubled.
Family history of testicular cancer has long been recognized as a significant risk factor. It is still the strongest known risk factor for testicular germ cell
tumors. Genetic effects have been estimated to account for about 25% of susceptibility to testicular cancer,putting it in third place with regard to heritability among all cancers. Having a brother with a testicular germ cell tumor increases a man´s risk 10 to 13-fold. This is higher than for any other cancer. Having a father with testicular cancer increases the risk 4-fold.
I would advise you to consult a surgeon and get the relevant investigations like CT scan
and testicular biopsy
done to arrive at the diagnosis.