Dark spot on mid-shaft foreskin

Hi all!

Noticed this tonight — admittedly, not sure when I got this. Presumably yesterday. Into the third week of Newbie Routine and tried pumping. Last I read, 5hg (and no higher) is preferable. Did this for about 15 minutes based on Week 2 of a Pumping Routine.
It’s basically a purple spot on the foreskin. There’s no pain whatsoever, but obviously I’ve caused some injury here. Have any of you had some experience with this? I’ll be doing a 15-20 minute hot wrap shortly to help it along.

How long do you think it would take to heal? Seemingly, PE might not be advised which is a bummer if so, because breaking consistency means rewinding progress to me.
Thanks in advance for the input!

Ah, can I add another question? Is there a sort of way to know if you’re jelqing properly aside from seeing if gains happen over the months? I keep feeling like the majority of the blood may be slipping through the grip, but obviously don’t want to tighten to extreme degrees.