Hello, Thanks for the query, The symptoms are clearly indicating sunburn . UV radiation of sun trigger melanin producing cells melanocytes to produce excess melanin , which produce dark spots. Apply ice pack several times . Apply broad spectrum sunscreen with SPF 30+ . Apply kojic acid cream twice a day . Take oral vitamin c supplements along once a day for atleast one month. Use a gentle cleanser e.g cetaphil cleansing lotion, twice daily. Consult dermatologist for proper diagnosis if above treatment doesn t work. Doctor may prescribe hydroquinone ointment or retinoids . Wishing you a good health. Thank you Dr Harry Maheshwari