Pityriasis Flashcards
What are the types of pityriasis?
Pityriasis versicolour
Pityriasis rosea
Pityriasis alba
What is pityriasis versicolour?
Yeast infection of the skin
What is the causative organism of pityriasis versicolour?
Malassezia furfur
What are risk factors for pityriasis versicolour?
Hot humid environment
Increased sweat
Immunosuppression
What are the features of pityriasis versicolour?
Diffuse papules + patches
- red and white
Pruritus
Where does pityriasis versicolour affect?
Trunk
Neck
Arms
How is pityriasis versicolour managed?
Topical antifungals
NO STEROIDS
What is pityriasis rosea?
Viral rash
What are the features of pityriasis rosea?
Coryzal prodromal features
Herald patch
- single patch
- oval
- 2-5cm diameter
Secondary rash
- patches
- plaques
- limbs
What are the causative organisms of pityriasis rosea?
HSV 6
HSV 7
What is the management for pityriasis rosea?
Self-limiting (6-12 weeks)
Emollient use
What is pityriasis alba?
Low grade type of eczema
What are the features of pityriasis alba?
Patches
- 0.5-5cm
- face, neck, shoulders
- hypopigmentation
How is pityriasis alba managed?
Emollients
Avoid direct sunlight exposure
