There are some normal lumps you should find in your scrotum. Firest, obviously, there should be two testicles. It is normal for one to be largerthan the other and for one to hang lower. (Usually the left).
Second, sitting on the top, back side of each testicle you should feel a soft, squishy mass. It has been described as a "bag of worms". This is the epididymis, the beginning of the tube that carries sperm away from the testicle. This is normal.
If the lump is hard that's abnormal and should be seen by a doctor. If you give some more description we could give a more complete answer.
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