Unfortunately I don’t think there’s a way to get rid of the starch marks, no matter where they occurred.
Other guys develop foreskin stretch marks as well. They may be small and red or long and white. It is quite likely that they formed from too much foreskin stretching.
Have you ever practiced any penile enlargement exercises? Stretch marks are likely to form then but there is also foreskin stretching in masturbation.
You may decide to use some kind of moisturizer or lubrication when masturbating, so more stretch marks wouldn’t appear or you may decide to see a dermatologist and ask if there were a way of removing them.
As far as I know, they are very hard to remove.
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