Dr. Levine answers: These are not symptoms of PD. A change in the sensation of the glans may be due to underlying medical problems such as diabetes which can affect the sensory nerves of the penis. Change in the color or pigmentation of the glans is usually more of a perceived problem, unless there are real lesions (ie ulcers, lumps) on the glans which should be examined by an urologist. I have seen men who have white spots, changes in color from purple to blue, white, and pink, which are within the realm of normal depending on blood flow. Glans color may be affected by external factors such as temperature and anxiety. The numbness of the testicles is another issue which I cannot explain, but may be due to the compression of the nerves in the perineal area. If you are an athlete who performs straddle sports such as bike riding this may affect these nerves. Lastly, your diminished penile rigidity may be an indication of erectile dysfunction and should be assessed by a urologist, this may be a vascular, neurogenic and/or psychogenic problem.