A stage 1 pressure injury is a reddened, painful area on the skin that does not turn white (blanch) when pressed. That one description contains the test that matters.
Does not turn white when pressed. That’s the whole difference, and it’s something you can check. Ordinary pressure marks go pale under a finger and then the color comes back. A stage I pressure injury does not go pale.
The skin may be warm or cool, firm or soft. In other words, temperature and texture don’t settle it either way.
This is a sign that a pressure ulcer may be forming. Stage I is the warning, not the wound. The skin is still intact.
That’s why it’s the stage that matters most to catch. Stage I or II sores will often heal if cared for carefully, while stage III and IV sores are harder to treat and may take a long time to heal.
One limit is worth stating. The blanching test is described on skin where redness shows. Wound Wizard can’t give you a description of how stage I appears on darker skin, and won’t invent one. Where redness is hard to see, what remains is pain, and skin that feels warm or cool, firm or soft, compared with the skin around it.
Where to look is the other half. Pressure sores tend to form where skin covers bony areas with less tissue underneath: buttocks, elbow, hips, heels, ankles, shoulders, back, and the back of the head.