Dark circle under eyss is a symptom of udavarta (improper functions of all vaat).It's mainly due to1) dharniya vega (urges, should b controlled, we you aren't) like chinta-stress, bhaya-fear, shoka-, krodha-short temper, maan- ego, lobha-greedy etc mental condition you should control yourself2) adharniya vega (urges that should not be controlled, but we are controling) like sleep, urine, stool, hunger, thirst, yawn, sneeze, vomit etc. Think deeply. It's a very spiritual conceptmain treatment is to stop causative factor among this. So manage your sleep & time. Also there are some ayurveda medicine, lepa-cream, face treatment, or panchakarma (detoxification) will definitely help youyou can use kumkumadi ointment of nagarjun pharma. It will lighten your circle. You can cunsult me if any problem.