 [ Symptoms ] 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 is right away the dr looked at the bumps and said this definitely is not an std it is 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 is just a hard fleshy lump and nothing comes out but blood any thoughts or similar experiences [ Disease ] stop doing home surgery on your penis lumps before you get a secondary infection since i can not 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