Thanks for your query,based on the facts that you have posted it appears that you have small lump in your Rt testicle and have mild pain.
This is most likely to be due to what is called as Spermatocele
associated with Epididymitis
However this can be confirmed only on clinical examination by a qualified Urologist
and ultrasound scanning.
Spermatocele is a benign cyst
and not to be worried about it.
As regards hanging of the testicle lower than other side it is not significant and has no clinical importance to it.