Thanks for the query
This presentation can be seen with many skin diseases. The best option is to consult a Dermatologist. It is always reassuring to get a diagnosis and feel comfortable about the same. Hope it helps you.
It appears as Post inflammatory pigmentation but certain other conditions should be ruled out.
Next Steps
You need to frame your query more appropriately to get a precise recommendations, A clear photograph would have been helpful.
Health Tips
Avoid Self Medications.