I have noticed first off a possible std witch has been unwanted confirmed by a x girlfriend after her latest check up HPV . well anyways at the bottom of penis
of skin which is smooth and shiny. For such symptoms possibilities of eczema, psoriasis and wart ( flat wart) needs to be ruled out.
I suggest you to get it examined from a dermatologist and get a biopsy skin done to confirm the diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.