Just started pumping yesterday, it's not working

Urethra edema is a misnomer. What I described can be labeled (incorrectly) urethra edema. The edema is in your penis shaft and it compresses the urethra. The urethra is only a tube; not much area for edema to build up. It’s just reonding to the pressure of the edema buldup in your shaft. I started out saying urethra edema, then decided to be more accurate and didnt use that descriptor.

It’s just like any edema, it will go away. Over time, as you gain more experience you learn how to manage it. You’ve keyed in to one clue: 20 minutes. Next (probably) you’ll figure out the vacuum level that triggers the edema.

Try different combos of time &vac level to bracket your “problem” area.

Also, as your penis becomes more conditioned to pumping, the edema triggers will shift.

In my experience, my penis is slow to condition and quick to de condition.

That, and I could never keep the sound in. It would always slide out after a few moments. I thought about using surgical tape to hold it in place, but it would have been just another hassle.

I looked it up, it’s the "meatus" that gets huge with edema after. It looks like a bee stung it and it looks really bad. Is that common? I don’t understand why this started happening randomly…

I described a slight protrusion of the meatus, you are describing a huge protrusion. Dial your time/vacuum down until you find a better combination that produces a suitable result.

Is this a common occurrence? This has happened to me almost 4 times now. Today I did 10 x3 sessions at 5hg, with 4 minute breaks in between. This time I got it, but it subsided an hour quicker than the other day when I did the 40 minute session… It’s a scary sight though. Does it look worse than it really is?

I don’t know how common huge ones are; small is not uncommon. I’ve had them. I’m guessing you are overdoing vacuum and/or time. If it goes away over time, as you said it does, it’s just edema. If you dont like the look, make sure you dont pump before sex or going to a nude beach.