Thanks for the query. That is a very limited description to make any comments. Many diseases in skin can present in a similar way. I can suggest you to see a dermatologist for a diagnosis and treatment plan. Delaying may not be a good option unless you know what the diagnosis is. Hope it helps you.
Next Steps
Meet a Dermatologist and discuss the situation, If needed a skin biopsy can be done to achieve a final conclusion.
Health Tips
Avoid Self Medications.