I have observed a slight discoloration on the corona of head of the penis.

Yesterday, while taking a shower, I have observed a dark discoloration on the corona of the head of penis. The discoloration is not just in a one site, but is symmetrically present all through the round border of the corona of the penis. I have absolutely no abnormal pain when I touch it. It does dont even look like a sore or an ulcer and not painful also. I have no abnormal discharges from penis or anywhere. No abnormal odor. No pain during urination also. But, I feel an EXTREMELY MILD discomfort at the root of the penis shaft. This discomfort is very mild and close to nothing and that too when I try to retract the foreskin, I will be able to feel this which is EXTREMELY MILD. I want to post a picture of it also but I feel very scared and embarrased to that and I have no one to share about this, which is making me even more stressed and it is getting out of hand to manage the stress that is coming out of this. but, after thinking I have decided to post the picture anyway. I want to beg everyone to look at the photo of it and help me regarding this. Thanking you.

image

Okay, you did the right thing in having the determination to do something about this
You need to be clear about the circumstances that you currently have with your penis, that, they consist of two entirely separate issues: i.) what you see in the photo; and, ii.) what you feel, that is, the mild discomfort at the root of the penis shaft. These issues are extremely unlikely to be connected.
In detail, when you state:
" I have observed a dark discoloration on the corona of the head of penis. The discoloration is not just in a one site, but is symmetrically present all through the round border of the corona of the penis "
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… this in the main is likely to be the normal make up of your penis and is simply how it has naturally developed - many men have this, from barely noticeable to being very clearly present across the entirety of the head of the penis. This is normal and is not a problem in any way.
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However, I am concerned with what I see right in the centre of the back of the head of your penis and the accompanying red marking right at the top of the shaft of your penis immediately below the head.
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What you need to do, so that I can further comment is to take a photo of the same area as in your existing photo - take it a little closer, but you need to take the photo in bright daylight - such as to the side of a window, indoors where you cannot be observed from outside …