What could be the cause of change in skin color at the back of the penis, upper thighs, and buttocks?

Hi,

Welcome to icliniq.com.

I have seen your query and concern and examined your picture (attachments removed for patient identity protection). It seems you have developed tinea cruris. Tinea cruris is a fungal infection of the groin.

Follow certain general measures.

1. Do not keep the area wet at all. Use Clotrimazole powder frequently to keep it dry.
2. Avoid itching, and do not scratch it. Change the undergarments regularly. Avoid excessive sweating and wet clothes.
3. Do not apply any general or steroid creams like Betnovate, surface ointment (Clotrimazole (1 % W/W), Betamethasone (0.05 % W/W), Tolnaftate (1 % W/W) Neomycin (0.5 % W/W) Quad riders, Itch guard, and Penderm.
4. Do not stop the medicine once you are cured. Continue medicine for a long time to completely kill the fungal infection.
5. If it is recurrent even after proper treatment than check diabetes and thyroid.
6. It is not a dread disease (life-threatening) and almost has nil complications, but It can be transferred. However, The measures mentioned above can easily prevent it.
7. Look, fungus always needs humidity and a wet area to penetrate. So, just do not give it a chance by keeping it dry.

This time, the fungal infection is not responding to Terbinafine (Terbina force) or Fluconazole, which may be because of resistant development. You can take the tablet Itraconazole 100 mg once a day and KZ (ketoconazole) cream twice local application for one month after consulting your doctor or nearby dermatologist.

Thank you.