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A squishy, spherical sac is 99% of the time going to be a cyst. Is there a hair growing out of it? Then it's probably a sweat gland that got infected. Actual testicular cancer would be a lump on the testicle itself. Regardless, if it's that big, you should probably get it removed. It will take about 5 minutes and you might even get a happy ending from the nurse.
t. guy who had cyst removed from neck.
