Thanks for the query,
You might have developed candidial infection.
It is a fungal infection
Penile shaft is a common site.
Treatment can be with oral antifungals as well as with topical antifungals.
Both the partners must be treated.
Various antifungal powders like candid are availabe.
These can help reduce the moisture as well as control the infection.
Please dont use any steroid
, it can worsen your condition
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you good health,