I am 25 year old male with no outstanding medical diagnosis or condition and am on no medication.
I have a couple of small (~1/2 cm x ~ 3 mm respectively), hard, white, scar tissue-like (harder and more fibrous than surrounding skin when I try cutting into them), slightly raised spots right where the head (circumcised) meets the shaft of the penis. One is on the end of the shaft and the other is under the shelf of the glans. It is right where my thumb is when I hold it with my left hand to urinate. The first spot on the shaft started many years ago (circa 2000, perhaps before initiating sexual activity, though not 100% sure of this) as one tiny (few millimeters) dry scale that I would always pick (sometimes causing bleeding when nearby skin was torn). Over the last year or two, it has gotten a little bigger (very slow growth, likely due to me picking at it). It is solid and slightly raised (almost like scar tissue), and is deeper than the epidermis.
There is no discoloration, protrusions, etc that point to skin cancer (or at least the skin cancer that we laypeople are told to look out for). The recent (over the past year or so) slight growth, and the creation of the second spot on the underside of the shelf of the glans, that has occurred has been a result of me creating an open wound by tearing it off resulting is the smaller secondary bump on the underside of the head and when I tried removing it with salicylic acid (I had some left over from a plantar on my foot that I was treating, so I gave it a go). It is rather flat, however, there is a very slight gain in altitude at the bottom of the scar (not equal thickness throughout).
I went in for a checkup last fall and showed the spot to the PA. She said that it was not likely an STD, did not appear cancerous, and possibly some sort of sclerosis. She advised me to stop picking at it.
Everything that I have read about penile warts or cancer makes them seem to progress a lot faster than this. However, I am concerned by the fact that this is advancing, albeit at a crawling pace over many years. The pinkish skin at the end of the shaft is definitely more sensitive than most, making usual assumptions about skin more difficult.
Any insights are greatly appreciated.