Diagnosing itchy versus non-itchy rashes

Question 1

An itchy rash is typically caused by:

Answer 1

Non-infectious conditions

Question 2

A non-itchy rash is most often caused by a:

Answer 2

Virus or bacterial toxin

Question 3

What is the first question you should ask patient?

Answer 3

Whether or not their rash is itchy?

Question 4

Common causes of itchy rash:

Answer 4

1. Eczema
2. Urticaria
3. Drug eruption
4. Chickenpox

Question 5

What is the commonest cause of itchy rash?

Answer 5

Eczema

Question 6

How to distinguish drug eruption from other rashes?

Answer 6

Drug-induced rashes tends to coincide with starting a new drug treatment

Question 7

How to distinguish hives from other itchy rashes?

Answer 7

Urticarial hives usually move around within 6 to 12 hours

Question 8

What is the exception to the rule that itchy rashes are generally caused by non-viral conditions?

Answer 8

Chickenpox

Question 9

Clinical fts. of Chickenpox:

Answer 9

1. Acute fever
2. Blistered rash
3. Itchy rash

Question 10

Common causes of non-itchy rashes, which are typically caused by a virus or bacterial toxin:

Answer 10

1. Scarlet fever
2. Infectious mononucleosis
3. Viral pharyngitis

Question 11

Fts of Scarlet fever:

Answer 11

1. Non-itchy rash
2. Tiny pinkish-red spots
3. Covering whole body
4. Recent Strep infection - toxin released

Question 12

Fts of Infectious Mononucleosis:

Answer 12

1. Non-itchy rash
2. Faint rash
3. Mouth sores
4. Resolves after +/- 1 week

Question 13

Fts of viral pharngitis:

Answer 13

1. Non-itchy rash
2. Sore throat
3. Enanthema - rash inside mouth