Unafraid of a little sweat Besides damaging hair, permanent hair dyes (hydrogen peroxide included) can irritate skin and cause inflammation if the amount and dyeing time are not carefully controlled or if used on an injured head.
含雙氧水的永久性染髮劑，除了會傷害頭髮，若使用時濃度、時間控制不當，或皮膚上有傷口，還會導致接觸性皮膚炎。