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We frequently get people coming into the clinic who have experienced sunburn on a bald patch/thinning hair - often experiencing this is their cue to come in and see us about hair restoration both from an aesthetic reason, but also as a way to protect the scalp from future sun damage. For the majority of people who aren’t experiencing hair loss, however, if you do get sunburn on your scalp, although you may lose a few hairs if your scalp peels, the chances are it will grow back.
In summary, no, getting a sunburn on your scalp doesn't mean that hair loss is more likely to happen, but regardless you should take steps to prevent sunburn from happening in the first place. Ensuring you’re wearing a wide-brimmed hat and avoiding the hottest parts of the day are good measures to put in place.