Tube-Like Hard Lump On Testicle, it looks like a hardened vein

I recently found a short tube-like, semi hard lump, almost like a little ridge, like a hardened vein. It seems to be connected to the epididymis, but I can't tell for sure. Could a longer, sprawled out lump be cancerous? Any suggestions or help would be appreciated, in need of peace of mind! :|