"In a stage II pressure ulcer, part of the dermis and epidermis are lost."

"In a stage I pressure ulcer, there is a loss of integrity of the epidermis only."

"In a stage III pressure ulcer, a deep tissue injury can expose fat."

"In a stage IV pressure ulcer, the base of the wound is covered by eschar."

"Stage III involves extensive tissue damage and can lead to bone and muscle involvement."