Warts on neck, also called verruca is a viral disease.
It is a contageous disease.
It is not related with leucoderma , you have on penile skin.
Verruca is easily treated by electrocauery under local anaesthesia.
It is an OPD procedure.
Take immunobusters like levamisole
for long time to improve the immunity, which prevent the recurranceof verruca.White patch
in penis may be either vitiligo or post inflammatory leucoderma
If it is not embarrasing , leave it untreated.
Otherwise, consult dermatologist
, have perfect diagnosis, then go for treatment.
I hope you got my answer.
Dr. Ilyas Patel MD