Hello. Thanks for writing to us at healthcaremagic I will keep a possibility of facial melanosis. Contact dermatitis to hair dye could be a possible cause. Your treatment is on the right track and you may continue with it Sunscreen is an essential part in the management of any facial hyperpigmentation. I usually suggest my patients to use a broad spectrum sunscreen, throughout the day. It should be reapplied every 2-3 hours. It should have both UV A as well as UV B coverage. A broad spectrum sunscreen that has a minimum spf of 30, would be suitable. I can see that you have been prescribed a sunscreen already. You may continue with the sunscreen that has been prescribed to you. The cream which has been recommended for night use is a combination of tretinoin, hydroquinone and mometasone. This combination is a gold standard treatment for pigmentation. However, it should always be used under the supervision of doctor and never for more than 1-2 months because it may cause side effects related to the steroids content of this cream like acne, skin thinning etc. In my patients of facial pigmentation I usually begin with this combination and continue it for 4-6 weeks and then stop it. Thereafter I substitute it with a different skin lightening cream containing one or more of the following active ingredients e.g Azaleic acid, Hydroquinone, Kojic acid, Arbutin, Glycolic acid, licorice extract, Niacinamide, Vit C etc. These ingredients are steroid free and can be given for a longer duration. You can discuss this in more details with your treating dermatologist. Regards