Purple lump/bump on shaft of penis under penis head

Hi, I'm 17 and ive had a purple bump/lump on one of the veins of my penis for awhile now. It gets larger with an erection. Ive never really thought much of it but it seems to have gotten larger. Also, in the past 3 days ive been experiencing a sharp pain inside my penis when throbbing it during an erection. Please help, im quite scared.

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It looks very normal.

Keep a watch on it, in case it grows, get it checked.

Don’t worry.

I agree with what Lostknight has said. Perhaps if you think of it this way: it is very easy to forget that your penis looks a whole lot different to what it was when you were around 8 years of age, the major difference, obviously, is size. You are still in a major growth period - of what most people refer to as ‘puberty’ and your penis may continue to grow naturally until your early to mid-twenties. So, things like this can even themselves out - certainly, as with is the same with some areas of our body, perhaps, never looking perfect, or the ideal.
It could potentially be a weakness, or it may simply always to look as it is now and function perfectly normally throughout your adult life …

looks like to much masturbation or slight damage to the veins, doesnt look like anything sinister though just keep an eye out for any serious changes