Papulosquamous Diseases Flashcards
What are the morphological hints for plaque psoriasis?
- Erythematous plaques with a “Silver scale”
- Locations: elbows, knees, scalp, umbilicus, gluteal cleft
What are risk factors for psoriasis?
Smoking cigarettes Alcohol Obesity beta blockers lithium Corticosteroid withdrawal
What disease is commonly associated with plaque psoriasis?
Arthritis in 10-25%
Ask patients about joint pain
What are some variants of psoriasis?
Napkin Guttate Pustular Erythrodermic Palmoplantar Inverse
How do you distinguish napkin psoriasis?
In diaper area of infant; see well-demarcated plaques with scale
How can you tell erythroderma from psoriasis from other causes of erythroderma?
you can’t!
What are the two types of palmoplantar psoriasis?
- Pustular form
- Dermatitis one with fissures following skin line
People with nail psoriasis are most likely to have what associated disease?
Psoriatic arthritis
What are some features of nail psoriasis?
- Pitting
- Oil spots
What do you want to ask a patient with lichen planus about?
Hepatitis C (especially with erosive type!)
What are the morphological features of lichen planus?
- Purple, polygonal, pruritis, plaques
- Wickham’s striae: Fine scale (reticulated white lines)
- Oral involvement, can be erosive
Does lichen planus get better when you treat Hepatitis?
NO! not necessarily
What are characteristics of nail lichen planus?
- Shortened nails
- No pitting
- Longitudinal fissures
- “twenty nail involvement”
What are the characteristics of oral lichen planus?
white lacy pattern and erosion of oral mucosa
What is the cause of pityriasis rosea?
NO KNOWN CAUSE
