Stage 1 Pressure Ulcer
Category/Stage I: Non-blanchable erythema
Intact skin with non-blanchable redness of a localized area usually over a bony prominence. Darkly pigmented skin may not have visible blanching; its color may differ from the surrounding area. The area may be painful, firm, soft, warmer or cooler as compared to adjacent tissue. Category I may be difficult to detect in individuals with dark skin tones. May indicate “at risk” persons.
Resource
(http://www.npuap.org/resources/educational-and-clinical-resources/npuap-pressure-ulcer-stagescategories/)