Hi
Since you have applied steroid that's why the morphology has changed. This could be tinea which is a common fungal infection. It is treated with antifungal medicines.
Steroid damages the skin and treatment of infection becomes very difficult.
Next Steps
consult a dermatologist for detail prescription.
Health Tips
avoid sharing of soap towel and personal hygiene products.
wash your clothes separately.
wear loose cotton clothes.
stop applying over the counter steroid creams.