Other signs are red marks on the skin and lack of iron in the body.

VOA: special.2010.06.15

Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?

水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体,火星，铁，为什么火星是红色的？

麻省理工公开课 - 固态化学导论课程节选

It's a protein that's produced by other cells in the body and when it's enriched in a certain area it stimulates more production of red blood cells.

这种蛋白由体内的另一种细胞生成,而当其在某处富集时,就会刺激红细胞生成

耶鲁公开课 - 生物医学工程探索课程节选

They may have a high body temperature and some areas of skin may turn red.

VOA: special.2009.05.26

Most commonly,their face, neck and sometimes their whole body turns red.

VOA: special.2009.05.13

Most commonly,their face,neck and sometimes their whole body turns red.

VOA: special.2009.06.23