** Thanks for contacting HCM with your health concern. 1. occurrence of white patches post sun burn is/are the effect of prolonged exposure to ultraviolet rays on areas constantly exposed which could also be due to the low level of melanin [the pigment which gives skin the colour] 2. you should consult a dermatologist, to check for other associated skin infections which can result in low level of melanin like tinea versicolor, vitiligo, use of birth control pills. 3. If the spot is/are caused by fungal infection then OTC [over the counter] anti fungal ointments and medicated creams prescribed by a dermatologist can be applied 4. Other measures which one can adopt is/are: . Proper hydration [plenty of fluids/juices/herbal teas. . use good quality sunscreen [minimum SPF 20] . products which are rich in vitamin E and contain alpha hydroxyl acids are good for the skin . One can apply a mixture of honey-turmeric and sandalwood powder on the affected area. . Avoid going/moving outside during the peak hours [11 am to 5 pm] to avoid getting tanning and too much exposure to ultraviolet rays. . coconut oil, lemon juice,ripe papaya,yogurt are also helpful PS. It will be good to have a snapshot of the affected area for better understanding and management of the disease.