Pityriasis Versicolor Flashcards Preview

B - Dermatology > Pityriasis Versicolor > Flashcards

Flashcards in Pityriasis Versicolor Deck (20):
1

What is pityriasis versicolor?

A superficial fungal infection of the stratum corneum leading to hypo- or hyperpigmented macular lesions on seborrhoeic areas of the trunk

2

What cause pityriasis versicolor?

Proliferation of the lipophilic fungus of the genus Malassezia

3

Where is Malasezzia fungus usually found?

In the flora of the skin

4

What parts of the body is Malasezzia normally found as a floral organism?

Sparsely in seborrhoeic areas (scalp, face and chest)

5

When does Malassezia change from a harmless commensal to a pathological organism?

When it changes to its mycelial form

6

What are the risk factors for pityriasis versicolor?

- Teenagers and young adults
- Hyperhidrosis or increased physical activity
- Occlusive clothes, dressings or ointments
- Immunosuppression or immune deficiency
- Malnutrition

7

Describe the onset of pityriasis versicolor?

Insidious and can take several months to be noticed

8

How to pityriasis versicolor lesions appear?

Macular lesions and patches of altered pigmentation with superficial scale

9

Where do pityriasis versicolor appear and spread to?

Often start on the trunk and then spread to the neck, upper arms and abdomen

10

Is itching a feature of pityriasis versicolor?

Only mildly if at all

11

How does the pityriasis versicolor rash change as it resolves?

Can change from scaly and brown to non-scaly and white

12

Is pityriasis versicolor contagious?

No

13

What are the differentials for pityriasis versicolor?

- Vitiligo
- Tinea corporis
- Seborrhoeic dermatitis
- Guttate psoriasis
- Discoid eczema

14

How should pityriasis versicolor be managed initially?

Topical anti-fungals e.g. clotrimazole, ketoconazole

15

In what forms are anti-fungal treatments for pityriasis versicolor available?

Creams or shampoos

16

Which formulation of anti-fungal is preferred for pityriasis versicolor?

Shampoo applied, lathered and left for 3-5 mins before washing off

17

How long should anti-fungal shampoo be used for in pityriasis versicolor?

5 days

18

What treatment is needed for pityriasis versicolor in widespread or resistant cases?

Oral itroconazole for 7 days

19

How long can it take for pityriasis versicolor affected skin to return to normal?

Several months

20

What are the potential complications of pityriasis versicolor?

- Recurrence
- Hypopigmentation of the skin which can persist for months after