Hi..thanks for your query There is a possibility that you have developed Melasma. This condition is aggravated by UV light sources, sun maximally. Please wear a sunscreen with broad some thrum of action during the day time.its is important to use umbrella and reapply the sunscreen 4-6 hourly. You can use a combination of hydroquinine, mild steroid and Retinoid on the patches at night for 6 weeks. following which you should review for the further line of therapy Melasma is a very chronic recurrent condition.hence I would advise you to start the treatment by visiting a dermatologist soon. Hope this helps ...take care!