Assertion: degree frostbite | /r/HasProperty | marked by affected areas
Facets:
value: sometimes only after
type: TEMPORAL
Source sentences:
text: Fourth-degree frostbite (or grade 4) is marked by affected areas beginning to show signs of necrosis by turning yellow, blue, grey or black, and becoming hardened (much like wood) – sometimes only after being rewarmed and treated by a medical team of professionals.