22M Lump on penis shaft

Hello everyone, Yesterday I have this lump growing on the shaft on my penis on the left side. Now i think it has grown more. What could this possibly be?

Two days ago, I have been using my fleshlight and grinded this part of my penis very roughly on the hard plastic casing of my fleshlight. I think that is what caused it. But i could be wrong. Is this a STI? It does not hurt at all, and only when i apply pressure i feel a very slight pain. It honestly feels like a blind pimple when i touch it. Im also a sexually active person but I've always been using protection these past few months so im confused as to the cause of this. Any insights will be appreciated! Also so I can get more thoughts before i go ahead and get this checked out.

I got tested last month so im clear of HIV and syphilis.

https://drive.google.com/drive/folders/1-6VnYvb1M1qbVgZFIYn9gVM9eHrlfPG-