 [ 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 ] since food is the major source of infection close attention to diet is of foremost importance in the prevention of travelers diarrhea foods should be well cooked and served warm raw vegetables uncooked meat or seafood and other foods maintained at room temperature should be avoided dairy products tap water and ice including frozen drinks not made from filtered water are also high risk foods carbonated beverages beer and wine hot coffee and tea fruits that can be peeled and canned products generally are safe the risk for developing diarrhea increases when eating at restaurants and when purchasing food from street vendors also frequent hand washing with soap and clean water will decrease the likelihood of the bacteria is spread