Non-blanching rash

Non-blanching Rash

A non-blanching rash is a type of rash that does not fade when pressure is applied to the skin. This characteristic is often used to differentiate between different types of rashes and can be an important clinical sign in diagnosing various medical conditions.

A non-blanching rash associated with vasculitis.

Causes

Non-blanching rashes are typically caused by bleeding under the skin, which can occur due to a variety of reasons. Some common causes include:

• Vasculitis
• Meningococcal infection
• Thrombocytopenia
• Henoch-Schönlein purpura
• Sepsis

Vasculitis

Vasculitis is an inflammation of the blood vessels that can lead to a non-blanching rash. The inflammation can cause the blood vessels to weaken and bleed, resulting in the appearance of small red or purple spots on the skin known as petechiae or larger patches known as purpura.

Meningococcal Infection

A non-blanching rash can be a sign of a serious bacterial infection such as meningococcal disease. This condition requires immediate medical attention as it can lead to meningitis or septicemia.

Thrombocytopenia

Thrombocytopenia is a condition characterized by a low platelet count, which can lead to increased bleeding and the development of a non-blanching rash. This can occur due to various causes, including immune thrombocytopenic purpura (ITP) and aplastic anemia.

Henoch-Schönlein Purpura

Henoch-Schönlein purpura (HSP) is a form of vasculitis that primarily affects children. It is characterized by a non-blanching rash, joint pain, abdominal pain, and kidney involvement.

Sepsis

Sepsis is a life-threatening condition caused by the body's response to an infection. A non-blanching rash can be a sign of sepsis, indicating the presence of disseminated intravascular coagulation (DIC) or other serious complications.

Diagnosis

The diagnosis of a non-blanching rash involves a thorough clinical evaluation, including a detailed medical history and physical examination. Laboratory tests may be conducted to determine the underlying cause, such as:

• Complete blood count (CBC)
• Coagulation studies
• Blood cultures
• Skin biopsy

Treatment

Treatment of a non-blanching rash depends on the underlying cause. For example:

• Antibiotics for bacterial infections
• Corticosteroids for vasculitis
• Immunoglobulin therapy for immune-related conditions

Related Pages

• Rash
• Petechiae
• Purpura
• Vasculitis
• Meningitis