Dermatology Questions? Ask an Online Dermatologist.
Can you attach the photos here? Pain or itch? How old are you? How tall are you? How much do you weigh? Any other symptoms? Are you aware of anything which might have triggered it? Any medical medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
Let me look at the photos. Do you use condoms?
If it is psoriasis, it should be itchy. It could be penile Crohn disease. You should see a dermatologist to have a biopsy.
It is rare but reported in some clinical case reports. Do you have the photos before you applied cortisone cream?