It is reccomended to regular check the testis for any lumps or for anything that doesnt feel right.
Testis is the ovoid structure within the scrotal sack. Within the scrotal sack there is also the head, tail and body of the epididiymis.
The epididymis is full of small tubules where the sperm matures. These tubules sometimes get block and expand resulting on what is called epididymal cyst.
Epididymal cysts are harmless and very common.
Sometimes the tubules leak and sperm escapes within the scrotal sack resulting in pain sometimes. This is called hydrocoele.
Infections are also common in the testis resulting on an inflammed epididymis that can can also feel like a lump.
It is also possible for cancer to be developed inside the testis and it is therefore very important if you find any mumps to have them checked as sson as possible.