Welcome to HealthcareMagic forum,
Kiran what you have got now is called a post inflammatory patch.If its hurting you then take an antibiotic like azithromycin
(500mg) once daily for 3 days.Apply soframycin
cream over the wound for 7 days and a good sunscreen all over the face daily.Protection from direct sunlight is a must.Gradually after few days you would see either a dark patch or a pink patch which would gradually fade with time .If the patch is dark and doesn't go by itself then apply hydroquinone
cream(HYDE) (2%) over the patch when it is dry.