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Saturday, July 9, 2016

Importance of Symptoms in Dx of Skin Disease: Scabies vs Shingles

A recent case of a couple with scabies

Symptoms first developed towards the end of a holiday in a tropical forest setting

Each had similar symptoms to the other

Principal symptom was pruritus (itching and scratching)

Both cases responded very well to 2 doses of oral ivermectin, 7 days apart

About 3 weeks later, one of the partners re-presented with a rash and reported to staff as scabies that hadn't settled fully

However, the principal symptom was pain, with a mild itchy feel at times

The diagnosis was Herpes zoster (shingles) affecting the Left C6 distribution

This case is due for review in a few days


KEYS TO DIAGNOSIS IN THESE CASES
  1. SYMPTOMS
    1. SCABIES IS ASSOCIATED WITH INTENSE PRURITUS
    2. SHINGLES IS ASSOCIATED WITH SIGNIFICANT PAIN
  2. DISTRIBUTION
    1. SCABIES HAS A CLASSIC DISTRIBUTION, INCL GROIN, BREASTS, BUTTOCKS, WRISTS & ANKLES
    2. HERPES ZOSTER PRESENTS IN A DERMATOME DISTRIBUTION




Importance of Symptoms in Dx of Skin Disease: Scabies vs Shingles

A recent case of a couple with scabies

Symptoms first developed towards the end of a holiday in a tropical forest setting

Each had similar symptoms to the other

Principal symptom was pruritus (itching and scratching)

Both cases responded very well to 2 doses of oral ivermectin, 7 days apart

About 3 weeks later, one of the partners re-presented with a rash and reported to staff as scabies that hadn't settled fully

However, the principal symptom was pain, with a mild itchy feel at times

The diagnosis was Herpes zoster (shingles) affecting the Left C6 distribution

This case is due for review in a few days


KEYS TO DIAGNOSIS IN THIS CASE

  1. SYMPTOMS
    1. SCABIES IS ASSOCIATED WITH INTENSE PRURITUS
    2. SHINGLES IS ASSOCIATED WITH SIGNIFICANT PAIN
  2. DISTRIBUTION
    1. SCABIES HAS A CLASSIC DISTRIBUTION, INCL GROIN, BREASTS, BUTTOCKS, WRISTS & ANKLES
    2. HERPES ZOSTER PRESENTS IN A DERMATOME DISTRIBUTION