The culprit is thymic stromal lymphopoietin (TSLP), a signalling molecule secreted by damaged skin cells which elicits a strong immune response from the body to fight off invaders.

• 罪魁祸首就是胸腺基质淋巴生成素（简称TSLP），这是一种由受损的皮肤分泌的信号分子，受损的皮肤引起身体强烈的免疫反应以便对抗入侵细胞。