Pathfinder: Kingmaker Bloody Mess

Pathfinder: Kingmaker Bloody Mess is a DLC that adds bloodstains to companions and enemies, showing the effects of battle. The more Hit Points a character or creature has lost, the more bloody and battered they appear. Stains first show when their Hit Points fall below 80%.

Bloodstains

Not every creature can have bloodstains: elementals and incorporeal creatures, for example, are unaffected. Humanoids and animals bleed red, while other creatures can show different marks, such as black stains on undead clothing and green sap from plants.

You can clean wounded companions by restoring their Hit Points, either by resting your party or using healing abilities. The Bloodstains setting in the Game section of the Options menu controls whether the feature is visible and is turned on by default.