stop doing home surgery on your penis lumps before you get a secondary infection. since i can't examine you first-hand there is really no way for me to confirm or dispute the sebaceous cyst diagnosis so i would suggest that you see your primary care medical provider or a urologist for an expert opinion. cysts tend to be filled with a cheesy material unless of course they are calcified which may be the case for you.
is this a cyst? why does it seem to be spreading? . okay so first things first. i have 3 hard bumps at the base of my penis. first thing i did was go to planned parenthood and get tested for std's. right away the dr looked at the bumps and said "this definitely isn't an std it's likely a sebaceous cyst if i had to guess". the thing is when i researched those cysts they seemed to be filled with pus and fluid and when i have stabbed mine it's just a hard fleshy lump and nothing comes out but blood. any thoughts or similar experiences?