Can you post a picture if possible?
Any bending of the penis when erect?
Any pain in the penis ?
Itching or redness?
Please let me know.
I guess this to be small sebaceous gland under the skin. These are small sebum producing glands which can swell up and form a cyst under the skin. These cysts can slip under the fingers when tried to feel.
These are harmless and rarely cause problem unless infected.
You can visit your doctor to confirm this diagnosis.
As there is no pain it is less likely to be an infective in origin. Even a blood clot is usually painful and red.
If you have any more questions please let me know.
If is a blood clot or inflammation then it would subside of its own. Sebaceous cysts rarely disappear spontaneously.
Injuries are painful and self explanatory- you immediately find it and relate it to the injury. Lymphoceles don't present like this.
Fibrosis is nothing but scar tissue which is usually an aftermath of an injury.If it is due to injury then it will remodel itself to smaller size as long as there is no repetitive injury.
I hope this helps you