How to make veins on the bottom of my cock visible?

So on top I have a lot of veins, they are mostly all very visible and I love it but the bottom is very smooth. How can I make veins visible on the bottom of my cock?

Wrap half top with tape and use large cylinder then pump.

I mean try it just an idea to give it a shot.

Sorry, I should have said. I don’t use any equipment, just manual exercises.

I think it is impossible wo pump. I don’t know what others will say.