Here’s how often you should really apply aftersun to your skin
By Emma Clarke / 27 May 2026
Here, Dr Jonathan Kentley, consultant dermatologist and British Skin Foundation spokesperson, explains to Glamour UK what aftersun actually is, how it works, and how to get the most out of it.
“The reason that you have a sunburn is that the DNA damage sustained by skin cells from the sun was so severe that the cell dies. This causes inflammation and barrier disruption, so an aftersun product may help reduce discomfort, dryness and tightness by cooling and moisturising the skin,” he says. “Products containing soothing ingredients such as aloe vera or soy, and humectants that draw water into the skin, are particularly helpful for symptomatic relief.”
However, Dr Kentley stresses that there is a common misconception that aftersun somehow “undoes” sun damage or prevents long term consequences of UV exposure. “Unfortunately, it does not,” he warns. “It will not reverse DNA damage, stop skin ageing or cancel out an episode of sunburn. If someone is significantly burnt, blistering, or feeling unwell, aftersun alone is not enough and medical advice may be needed.”
