发红剂

例句：

1. 1. This medicineis used to treat skin conditionsthat cause redness.
   这种药物用于治疗导致皮肤发红的皮肤病。
2. 2. The chemicalagent was found to have a significant effecton the skin's color.
   这种化学试剂被发现对皮肤颜色有显著影响。
3. 3. Theuse of this product has been associated withincreased redness in the treated area.
   使用该产品与受治疗区域的红色增加有关。