Its nothing to do with stretched skin. You could tell it was (rapidly) stretched skin by the precense of stretch marks, but the darkening you seem to be referring to is probably a results of all the blood that gets pushed into the penis during PE. Some people say that doing PE makes our units darker in the long run. I’m not entirely sure why, but perhaps because the pressure of jelqing pushes some blood out of the capilliaries and into the skin or other places it isn’t meant to be, all be it in small amounts, which leads to a mild bruising kind of effect (at least thats the reason I’d imagine). This is often referred to as discoloration, and you can find lots of info on it and how to avoid it using the search tool.
But I don’t think thats exactly what you meant. You were talking about the lighter skin just under the glans, so I assume you mean to say that on the after pictures it seems more visible than on before pictures. This would probably be due somewhat to the discoloration of the rest of the shaft as I’ve written about above, but for some reason the inner foreskin (or remnant of) doesn’t discolor. The non-discolorising of the inner foreskin/remnant I can’t explain, but I think it leads to a nice effect, and I’ve just started noticing it on my penis, or at least in the latest pics I’ve taken of it (not so noticeable in actual day-light as it is with the light of the flash). I don’t know about others, but my inner foreskin remnant was never lighter than my shaft skin, but very slightly darker, and now it changed I guess I’m marked as a PEer to the rest of the world - at least I would be if they new… :p
Start: 22 Mar 04: 6.5" BPEL x 4.6" EG & 6" head. As at: 1 Jan 05: 7.5" BPEL x 4.8-4.9" EG & 6.3" head.
Re-re-start!: 6 Feb 17: 6.9" BPEL x 4.9" EG & 5.5" head. As of: 23 Feb 17: 7.0" BPEL x 5.0" EG & 6.0" head.
Ideal: ASAP: 8+" BPEL x 5.5+" EG & 6.5+" head But will continue if the going is good!!