What does it mean if a rash is Blanchable?
Many people are familiar with the so-called “tumbler test” or “glass test”, whereby a glass or other clear surface is pressed onto the rash. If it disappears when pressed, this is known as a blanching rash.
What does it mean if a rash doesn’t blanch?
Non-blanching rashes are rashes which do not disappear with pressure, particularly using the ‘glass test’. Most children with a non-blanching rash who are well will not have a serious underlying cause. In many cases, a simple viral illness (often adenovirus) is the final diagnosis.
Is it good if a rash blanches?
If the rash disappears or turns white it’s a blanching rash. Rashes that blanch when touched aren’t usually serious. Most rashes are blanching rashes, including virus rashes and allergic reactions.
How do I know if I have non-blanching rash?
Consider checking for non-blanching rashes using the ‘glass test’. This involves pressing the side of a glass or tumbler firmly against the rash to see if the rash fades or loses colour under pressure. A petechial or purpuric rash does not fade.
What causes a blanching rash?
Causes of Blanching Inflammation of the skin: This could include drug eruptions, hives, and more. Obstruction of blood flow to an area of the skin: Chemicals, cold, trauma, radiation, or chronic conditions can impair blood flow.
What skin lesions do not blanch?
It is used to determine whether a lesion is vascular (inflammatory or congenital), nonvascular (nevus), or hemorrhagic (petechia or purpura). Hemorrhagic lesions and nonvascular lesions do not blanch (“negative diascopy”); inflammatory lesions do (“positive diascopy”).
Is ringworm a blanching rash?
The eruption is composed of wheals, well-defined superficial swellings of the dermis that are characterized by raised, erythematous papules or plaques surrounded by a red flare. (See Figure 4.) Shape varies, but lesions often are round and blanch centrally, conferring an annular appearance.
Are hives Blanchable?
Urticaria multiforme, a morphological subtype of acute urticaria, is a benign cutaneous hyper-sensitivity reaction predominantly mediated by histamine that is characterized by the acute and transient onset of blanchable, arcuate, annular, polycyclic, erythematous wheals with dusky, ecchymotic centers.
Is HSP rash Blanchable?
Henoch-Schönlein purpura (HSP) is characterised by a non-blanching rash, which commonly affects the lower limbs of children aged 3-15 years. It is the most common vasculitis in children. HSP often develops after an upper respiratory tract infection and is more likely to present in autumn, winter and spring.
Which condition does non Blanchable erythema indicate about the skin tissue?
In stage 1 pressure injuries the skin is still intact with a localized area of redness that does not turn white when pressure is applied (also known as non-blanchable erythema). Stage 1 does not include purple or maroon discoloration; these may indicate deep tissue pressure injury.