Why is this problem?

Patient's question:

Doctor, recently I haven't masturbated for a few weeks, but this time during masturbation, I saw something white come out from under my foreskin.
The main thing is that seeing that thing made me scared, and then my penis gradually returned to normal.
What could be the reason for this?
First follow-up question: No, it shouldn't be. I don't know why it would come out automatically, and now it's itchy...
Second follow-up question: Doctor, after the afternoon passed, now I actually feel pain when urinating...

Doctor's answer:

This is not the case, because when ejaculation occurs, the human body has some reflexes of the nervous system. So the sensation that appears, if you hold it back, it may not have any impact. Moreover, there is no concept of reflux, and it certainly does not affect memory. This is not the case, so there is no need to worry.

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