Two Photosensitive Dermatitis Outbreaks Caused by Cordierites frondosus - Chuxiong Yi Autonomous Prefecture, Yunnan Province, China, 2023

( ) is a species of toxic mushroom known to induce symptoms of photosensitive dermatitis. In the months of May and June 2023, a total of four patients in Chuxiong Yi Autonomous Prefecture, Yunnan Province, were affected by poisoning, occurring over two distinct incidents. The condition of two patients deteriorated after they were re-exposed to sunlight on the seventh day following the initial poisoning. Separately, an additional two patients reported experiencing a mild, needle-like sensation on areas of their skin exposed to the sun, recorded on the twelfth day subsequent to the poisoning. Given that symptoms of photosensitive dermatitis, a potential severe consequence of poisoning, can manifest up to a week post-sun exposure, it is advisable to avoid sunlight for a minimum of two weeks following poisoning.