lump in penis

[Ryan__0__0]

  I am a 22 year old male, and a couple of days ago I noticed a
  small (~1cm long and a few mm wide) hard lump underneath the
  skin of my penis.  It is located  on top towards the upper part
  of the shaft but below the head by about 1cm or less depending
  on the size of my penis.  It is not very deep inside, but it is
  definitely well underneath the skin (I can push it around a
  little like a vein).  It is more noticeable when my penis is
  erect.  It has not caused me any pain, and everything seems to
  be in working order.  I urinate fine, I was able to acheive an
  erection without any problems (though I felt like I could I did
  not try to actually have an orgasm), and everything appears to
  look fine too.  I have never had any problems with my penis,
  glands, testicles, or anything else in that region before - no
  unusual marks, smells, weird fluids, or anything.  The last time
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Dear Ryan,
The differential diagnosis of a lump on the penis is somewhat long and variable.  However, what you describe sounds like a thrombosed penile vein, or perhaps may be a plaque associated with Peyronie’s disease, or a skin process similar to a sebaceous cyst.
Superficial veins on the shaft of the penis are normal and usually do not cause any pain.  However, sometimes a vein can become thrombosed (clotted) and will then feel like a thin cord similar to what you describe as a lump and may (or may not) cause pain.  This is usually self limited and will go away in several weeks.  
Peyronie’s disease is a condition which involves curvature of the penis (which you do not seem to have) associated with penile plaques that are deep to the skin at the fibrous layer called the tunica albuginea.  I do not think that you have Peyroni’s disease based on the information you provided, although this diagnosis would also be best made by someone who can examine you in person.
Another possibility is a sebaceous cyst in the skin of the penis, or perhaps inclusion cysts at the circumcision site (if you are circumcised).  These diagnoses are benign, but can only be made by your doctor who can examine you in person and differentiate them from any possible worrisome process.
In General, since penile lesions can not be assessed on the internet, I am not in the position of evaluating you.  If this lump persists, I recommend you see your personal physician or a urologist who would be in better position to evaluate and possibly treat this condition.  Wish you the best.
This information is provided for general medical education purposes only.  Please consult your physician for diagnostic and treatment options pertaining to your specific medical condition. More individualized care is available at the Henry Ford Hospital and its satellites (1 800 653 6568).
Sincerely,
HFHS M.D.-JJ
*Keyword: penile lump, thrombosed vein
  I had sex was seven weeks ago with my ex-girlfriend (we broke up
  right after that).  Since then, I have been out of touch with my
  penis, but this is something I think I would have noticed had it
  been around for long.  This is something that I definitely did
  not have more than seven weeks ago (unless it was just very small
  before).  I have had no sexual experiences since then with the
  exception of two wet dreams, of which one occurred just one week
  ago.  The woman I had sex with seven weeks ago was the one
  partner I've had all my life, and I was hers as well (and we
  were both virgins when we met).  Overall, I think I live a very
  healthy lifestyle - no drinking, smoking, or drugs and I
  exercise regularly.  I am going to go see a physician, but I am
  very scared about what this might be.  Please let me know if you
  have any ideas.

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