Hi!Madheena,
Welcome to HealthcareMagic forum,
Dark circles are multifactorial....
stress is most common reason(as in your case it is after delivery)...
iron deficiency ,vitamin def can also lead to it..even lack of sleep is an important reason.Sunlight can aggravate your problem..so start with a good sunscreen daily .As far as black heads are concerned you can use
tretinoin cream 0.025% locally at night (apply very little..only if you are not feeding the child) ..use this cream every alternate nights...and use a sunscreen at day time.This would gradually take away your black heads.
take care,
Dr.chawda