Oilyness of the skin is natural.
Only the amount of oil secretion differs from person to person.
Oily nature of the skin is due to excess secretion of oil by the glands n hence this will cause problems like pimples
So it's imp not letting the excess oil stay on for long hence wash your face twice a day.
This will help in prevention of pimples n other skin issues.
Meanwhile for the marks you can apply orange juice mixed with turmeric powder till the marks disappear.