The effects of redface are identical to those of Sight Rot (see "Diseases" in chapter 8 of the Dungeon Master's Guide), but it's caused by pollutants in the air rather than contaminated drinking water, making it difficult to avoid.
Redface
Condition
Status Effect
Redface
This condition changes how a creature can act, move, perceive, or interact with the world until the condition ends.
Rules
1
section