Stage 1 Bedsores: The Earliest Warning Sign

You press your finger against a red patch on your mother’s heel. The redness does not go away. The skin feels warmer than the area around it. It has been there since your last visit, days ago. A 2023 meta-analysis found that 8.5 percent of nursing home residents have pressure injuries [PubMed 37801939]. Stage 1 is the earliest form – and research shows that 35.5 percent of stage 1 injuries deteriorate when repositioning protocols are applied [PMC7951350]. What you are looking at is not just redness. It is tissue damage that has already begun.

A stage 1 bedsore is the earliest warning sign. If your loved one has persistent redness that will not go away, the nursing home may have already failed in its duty of care.

Find Out If It Was Preventable

What Is a Stage 1 Bedsore?

The NPIAP defines a stage 1 pressure injury as non-blanchable erythema of intact skin. That means persistent redness – or discoloration on darker skin – over a bony area that does not disappear when you press it with your finger. The redness persists for more than one hour after pressure is removed [NPIAP / PMC5098472].

The skin is not broken. There is no open wound. But the tissue underneath is already damaged. Laser Doppler imaging studies show altered blood flow in these areas, confirming that the damage is real even though the surface looks intact [PMC7951759].

Understanding the difference between normal redness and a stage 1 bedsore matters:

• Blanchable redness fades when pressed. This is a normal response called reactive hyperemia. The blood flow is still working. It goes away on its own [NPIAP / PMC7951759].
• Non-blanchable redness does not fade when pressed. This means small blood vessels have been damaged and are bleeding into the tissue. It is actual tissue injury and requires immediate action [NPIAP / PMC7951759].

The standard test is the transparent disc method: press a clear glass plate against the red area. If the redness disappears under the disc, it is blanchable and not a bedsore. If the redness stays visible under pressure, it is non-blanchable and confirms Stage 1 tissue damage [PMC9139210].

Warning Signs of a Stage 1 Bedsore

• Redness on the skin over a bony area that does not fade when pressed
• The area feels warmer than the skin around it
• The area feels harder or firmer than normal
• Swelling or puffiness over a bony spot
• Your loved one complains of pain or tenderness at that location
• On darker skin: deep brown, ashy gray, or purple discoloration that does not blanch
• The area looks different from the same spot on the other side of the body
• The redness has been present for more than a day

Detecting Bedsores on Darker Skin

Stage 1 bedsores are harder to detect on darker skin tones. Non-blanchable erythema does not appear as red. Instead, it may show as deep brown, ashy gray, or violet discoloration. These hues are easy to miss under standard lighting or during a quick visual check [NPIAP / JAN 2025].

Research has found that this educational bias contributes to pressure injuries being diagnosed at later, more advanced stages in Black and Brown residents [Gunowa et al., JAN 2025]. Injuries that could have been caught at Stage 1 are missed until they reach Stage 2 or beyond.

The NPIAP recommends the SADS framework (Skin Assessment for Dark Skin) for residents where visual redness is hard to see. Nurses should check for: temperature change, firmness or hardness, edema or puffiness, discoloration including purple or blue patches, and sensation changes such as pain or tenderness [NPIAP / PubMed 38215295].

A quality improvement study using enhanced lighting paired with the SADS technique achieved a 6 percent reduction in facility-acquired pressure injuries [PubMed 38215295]. Better detection methods work when facilities use them.

Families should ask: “Does this facility use the SADS framework for skin assessments on residents with darker skin tones?”

When Is a Nursing Home Responsible?

Federal law requires nursing homes to assess each resident’s risk for pressure injuries and to prevent them [42 CFR 483.25(b)]. A facility-acquired stage 1 injury is treated as evidence that the care system failed.

The nursing home should have:

• Assessed risk using the Braden Scale or similar tool at admission
• Created a prevention plan for at-risk residents
• Repositioned the resident on a schedule (research shows that turning every four hours on a viscoelastic foam mattress produces fewer bedsores than turning every two hours on a standard mattress [PMC7265629])
• Provided adequate nutrition, including 1.2 to 1.5 grams of protein per kilogram of body weight per day
• Conducted skin checks at every shift

If any of these steps were missed, the stage 1 bedsore was likely preventable.

What Happens If a Stage 1 Bedsore Goes Untreated

Stage 1 is the moment where the outcome is still in the nursing home’s hands. The data tells the story:

• 64.5 percent of stage 1 injuries healed when repositioning protocols were applied [PMC7951350]
• 35.5 percent deteriorated to Stage 2 or deeper despite repositioning [PMC7951350]

That means more than one in three gets worse – even when the nursing home follows the correct protocol. Without repositioning, the odds are far worse.

When a nursing home acts promptly, resolution typically occurs within 7 to 14 days [PMC7951350]. That is a short window. But if the facility does not respond – if it does not relieve the pressure, does not adjust the care plan, does not increase monitoring – the wound can progress to Stage 2 and beyond.

A systematic review found that residents with non-blanchable erythema have significantly higher odds of developing Stage 2 or deeper injuries within 28 days [PubMed 31120145]. Stage 1 is not just a warning. It is the last chance to prevent serious harm. Understanding what causes a Stage 1 bedsore to form can help families recognize whether the nursing home’s prevention plan was adequate.