To treat your sunburn and scalp rash, follow these steps: Medicines: Apply pure aloe vera gel or OTC 1% hydrocortisone cream to soothe inflammation. Take ibuprofen to relieve pain and swelling. For scalp flaking, use a gentle shampoo or soap containing zinc pyrithione or ketoconazole. Diet: Drink plenty of water to rehydrate your skin. Eat foods high in antioxidants and Vitamin C (like berries and citrus fruits) to promote skin healing. Lifestyle: Avoid direct sun exposure and wear a wide-brimmed hat outdoors. Apply cool compresses to the area, avoid scratching, and use mild, fragrance-free hair products until fully healed.