Penile bass and groin. Solution pleasee!

I have something at the base of my penis on the left side which is under the skin and is round something inside which disappears when my penis is completely flaccid and again appears when penile size increases and when it's fully erected it also expands ,it soft when not much big and hard during my penile erection not much ,it doesn't pains when touched but creates pain sometimes and mostly when I have to poop and i feel the pressure while pooping ,it might has also affected my urinary stream and also creates a little discomfort while ejaculation ,I hv shown it to a lot of doctors but as I hv said in flaccid it's not even visible and they told there's nothing to worry about because they never saw that fatty layer at base ,I hv also posted its photos in my recent posts but I got no ans and I also feel pain and pressure in my prostate and upper thigh areas ..so please give plain me what the hell it is and give me a proper solution pleaseee!!!!