Concerned about Swelling on Rim

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Hello, So for about the past week when I masturbate I've been getting a swelling on my penis that is concerning me. It only happens during masturbation and goes away in about an hour after I finish. There is no pain at all when it happens but I'm not sure what might have caused this. I believe it might be a lymph swelling but have no medical knowledge so that is just my best educated guess. Do any of you know what this might be and how concerned I should be about it? Additional info that may/may not be pertinent: I'm in the 25-30 year range. I use lotion when masturbating. My masturbation sessions can be long 1hr+ I am gay, my last sexual encounter was in August - oral and hands only.

lymphocele its from masturbating lymphatic fluid trapped under the skin sometimes rubbing the area can get rid of it or u can just leave it be and it will go away by itself

they are not harmful an normally causes no long term effects

I thought it was lymph fluid but wasn’t sure, thank you for confirming. It’s happened on several different different days so I wasn’t sure if it was something more serious. Is there anything specific I should do to help/avoid in the future? I’m assuming that the best solution would be to avoid masturbation for several days.

not much u can do other than avoid maturbating