Welcome to HCM.Dark circles
are because of three basic reasons- Genetical (having family history), Nutritional (improper diet) and stress
( related to lack of sleep or excessive straining on the eyes by computer activities and related things).
The first one (genetical) is difficult to be improved but the last two reasons can be improvised. As per your history it appears more due to Nutritional (improper diet) and stress as you felt improvement after using the Melalite xl cream for a month.
Marks on your face can be due to pinching or picking acne
or touching your face unnecessarily.
Now using a cream beyond the time prescribed is not at all a good option as these cream are having own side effects after a certain period of time and under eyes being quite sensitive skin, so is more prone for that.
For both your marks and dark circles you can use / shift to some maintenance cream as prescribed by the doctor for long term usage as well to maintain the good effect. In these categories we use azelaic acid cream, Kojic acid
cream, glycolic acid
cream, licorice extract or arbutine or certain other good contents but under medical supervision and good guidance only.
Other than that to maintain the good effect, your diet and daily routine also play a very important role. You should eat at least 3-4 fruits/ day, drink more than 10-15 glasses of liquids, avoid long hours of work on computers and take good 8-9 hours of sleep per day and don't try to touch your face or pinch anything on face.
Above all keep yourself happy.....it will help in everything !!
Hope you find the answer helpful.
With best health wishes
Dr Sanjay K Kanodia