Lump on vein by Testicle

hi there , 

 

 

i have had for around a year and a half a very very small lump the size of about a quarter of a pea  not on my Testicle but on the vein near the Testicle. It can move but feels almost attached by a string . No pain , no swelling of testicles or other Symptoms just worried it could be cancerous . I believe it is called the eperdermis ? But not 100 percent sure if they should last for over a year . 

 

 

Any answers would be hugely appreciated 

 

Thanks