Differentials

Question 1

What are the differentials of a Blanching rash?

Answer 1

• Measles
• Rubella
• Scarlet fever
• Roseola
• Parvovirus

Question 2

What are the differentials of a Non-blanching rash?

Answer 2

• Meningococcal disease
• Henoch-Schonlein purpura (HSP) - purpuric rash on legs and buttocks + associated abdominal/joint pain
• Idiopathic thrombocytopenic purpura (ITP) - develops over several days in a well child
• Acute leukaemias - gradual development of petechiae, signs of anaemia, and infection
• Haemolytic uraemic syndrome (HUS) - oliguria and signs of anaemia, and presents in a child with recent diarrhoea