“变紫”的英语？

战俘们吓得脸色变紫.The prisoners went blue with terror.你的腿怎么了? 都变紫了.What's wrong with your leg? It's bruised.但在为时半个小时典礼结束之际,他的嘴唇也被冻得变紫.But his lips were turning purple toward the end of the half - hour rite....