Hello,
This red scaly spot on penis can be due to contact dermatitis, fungal infection causing tine cruris ,
lichen planus or genital warts(less likely).
Lichen planus is an inflammatory disease that affects the skin and the oral mucosa, and presents itself in the form of papules(flat spots) or rashes.Treatment is available only on prescription and consists mainly of steroids,retinoids,hydroquinone and phototherapy.