Hellgrowth

Hellgrowth is the name given to the flesh-like substance that appears in areas corrupted by Hell.

Classic Doom
The earliest version of hellgrowth, before it was really solidified as a concept, is usually represented by various textures such as, , and , as well as the corresponding flats. The first instance is found in in the moving pillar room, where organic columns constantly raise and lower. ,, , , , all feature additional examples. In Doom II, it can be found in, , , and especially in.

Doom 3
Hellgrowth is introduced in Administration, and prominently featured in Transfer Station, Delta Labs 3, Delta Complex, and Processing Distribution Center.

Doom 2016/Eternal
Hellgrowth is given its canonical name as well as some lore explaining its purpose in the Hellish corruption process besides being disgusting scenery. Special forms of it, such as gore nests and tentacles, are also introduced.