There isn't sufficient information to reach a specific diagnosis. I would advise you to visit a dermatologist so that you can be examined and undergo investigations such as
Vitamin D,
Vitamin B12,
thyroid profile, etc to find the underlying cause and have it treated accordingly. If the problem persists or worsens visit the dermatologist at the earliest.
Next Steps
Follow the steps as advised
Health Tips
If condition persists or worsens visit the dermatologist at the earliest