Most of the treatments, try to enhance blood circulation in the groin area or increase testesterone. Search for such exercises and do them regularly. Few of them are male deer exercise, Kegel exercises, Sat kriya. You can also learn kundalini yoga. If you continue for a long time, you may find the difference. there are many websites. Search them and do these exercises. There are few herbs which will help. you may read many threads in sexual health forum, man's health forum as well. I am sure you will find some technique which will be effective for you. No spell check done)
Do you have any treatment suggestions such as vitamins or supplements? Maybe injections of some kind or some sort of boosters for testosterone?
I will be doing exercises ,but I am not familiar with the ones you describe. However I will look them up to see what they are. Also I am just really concerned with the numbness. Either it is the Low-T, an STD or nerve damage or maybe all three who knows.
Numbness in the penis can be caused by nerve damage, or by skin damage due to rough masturbation. It is also often psychological in nature - in other words, you noticed something is different, and you are worried about it, and your anxiety leads to a perceived loss of feeling.
One way to improve the situation is to increase blood flow to the area through exercise, as well as avoiding long periods of sitting and wearing non-restrictive clothing. A penis health creme with vitamin C and l-arginine can also help stimulate blood flow and may help increase feeling in the area.