Dark circles can occur due to many factors- lack of sleep, dehydration, and to even allergy to your cosmetics... Also it can be due to fat loss under eyes..needs detailed history and examination from finding out the cause..
Next Steps
consult a dermatologist or plastic surgeon
Health Tips
sleep well, have plenty of water... medical treatment ranging from lightening creams, chemical peels to lasers. Also filler injection and fat grafting are also options