Brown, pale, sallow discolored spots on the face is sometimes an indication of hormonal imbalance. How are your menses? Are they regular?.Is the bleeding normal? Do you suffer from dysmenorrhoea or painful menses? Do you suffer from a white discharge? Have you undergone any Thyroid function tests?
Homeopathic Medicine has good remedies to see that the spots gradually regress with indication of common medicines like Caulophyllum, Sepia, Natrum mur, etc.