Hi.
Thanks for your query and an elucidate history.
.
Read your history and understood your problem.
It is odd to have hitting your own leg against the ground and have left
testicular pain. Then the development of loosening of the scrotal skin and now multiple black mole like discoloration.
The probable cause is that you had
testicular torsion which was missed by you and / or your Doctor.
There is a rare chance of some sort of
testicular cancer.
I would advise your the following:
-Have a clinical examination conducted by an
Urologist to get a proper clinical diagnosis and
-This is to be supported by MRI or
ultrasonography and color doppler examination of the scrotum.
Further treatment will depend upon the diagnosis one gets.
Till then have scrotal support.