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I can understand your concern.
I have gone through your query and the images and reports attached (attachment removed to protect teh patient's identity). It appears to be some sebaceous glands that can normally occur but are excessive in your case. It does not appear like any STD. However, it is imperative that a close clinical examination is necessary before making any conclusion. It is difficult to provide a permanent solution, though some treatments can be tried; I would not suggest it as there are no other symptoms. If you get symptoms in the future, they can be tried later on. If your erection causes a tight foreskin, you may require circumcision to prevent the foreskin from getting stuck behind the head of the penis (it can only be recommended whether you require it or not only after an in-person examination). It is a relatively simple procedure, and if you subjectively feel any difficulty, you can go ahead with a circumcision.
I hope this helps.
Kindly revert for more queries.