Thanks for writing to us.
It seems you have developed post inflammatory hyperpigmentation
due to garlic application.
To reduce these marks
Use a good sunscreen in morning
4 percent cream in night. Use the cream very judiciously. Do not apply large amounts and do not rub the cream as may lead to irritation. If the skin becomes red, irritated or dry on application, withhold its use.
You may also consider the option of chemical peels
to reduce these marks.
Hope that helps. Take care