Thanks for writing to us.
Such lesions in genitalia could be due to fungal infection
or tinea, seborrheic dermatitis
Fungal infection would require antifungal cream like clotrimazole
seborrheic dermatitis would respond well to clotrimazole and steroid cream
psoriasis would respond to steroids.
As you can see, the treatment in all these vary a bit. It would be better, if you meet your consultant dermatologist
for diagnosis and appropriate treatment.
Hope this helped.