Hello,
Shrinkage of penis commonly occurs due to trauma, skate boating or
sports injury. However, the other reasons may be obesity that causes reduced blood flow to the penis,
masturbation is healthy but over-masturbation may cause the penis to shrink.
Infection in the prostrate, infection like chlamydia, unprotected sex, or addictions like
smoking, alcohol, unhealthy junk food may cause the penis to suffer. You have pain in the tip of the penis with other symptoms, it looks like Chlamydia. If you are sexually active you are suggested to get
STD tests done. You may need antibiotics / antivirals, avoid sex while you are being treated.
Get clinically examined, do not hesitate. Ideally your partner should also undergo STD tests and get treated. You are suggested to avoid multiple partners and always go protected sex.
Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K, General & Family Physician