blanchable

Blanchable is an adjective used in dermatology and wound care to describe erythema that temporarily turns pale when pressure is applied and returns after release. The blanching effect occurs as superficial capillaries are emptied and then refilled with blood, indicating preserved perfusion.

Clinically, blanching is assessed by applying gentle pressure with a finger for a couple of seconds; if the redness fades under pressure and reappears when the pressure is removed, it is considered blanchable. Non-blanchable erythema—where the redness persists—can signal tissue damage or inflammation and is a criterion used in staging some pressure injuries.

Blanchable erythema is typically considered reversible and may reflect transient vasodilation or irritation from pressure, friction, heat, or sun exposure rather than tissue necrosis. It is less reliably observed in individuals with dark skin tones or in certain lighting conditions, and technique or patient factors such as edema, cold exposure, or vasoconstrictive medications can affect findings.

Interpretation should be integrated with overall clinical assessment, as blanching alone does not rule out evolving injury; serial assessment over time is recommended to detect changes.