Sun-damaged hair: If you’ve ever noticed your hair looking lighter after prolonged sun exposure, it’s likely a sign of scalp sunburn. If you’ve ever noticed your hair looking lighter after prolonged sun exposure, it’s likely a sign of scalp sunburn. Hair loss: UV rays don’t just damage the hair surface — they can also affect the follicles beneath. UV rays don’t just damage the hair surface — they can also affect the follicles beneath. Dr Sturnham warns that even one episode of scalp sunburn can raise your risk of skin cancer.