Individuals using retinol during summer are at a higher risk of sunburn and skin irritation due to the thinning of the skin's protective layer. This increased sensitivity can lead to blistering and discomfort if proper precautions are not taken. Those with fair or sensitive skin may be particularly affected. Dermatologists emphasize the importance of consistent sun protection to mitigate these risks, as well as the potential for long-term skin damage from UV exposure. Neglecting these measures could result in adverse effects, including heightened skin sensitivity and sunburn.