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
What are some features of pityriasis rosea?
- Herald patch (large tinea-looking plaque)
- Scaly rash that follows lines of cleavage (skin fold lines)
- “Christmas tree pattern” with salmon colored patches on back
What is the treatment of pityriasis rosea?
supportive (some topical steroid if patient has itching)
What are some hints that a patient has guttate psoriasis?
- Raindrop plaques
- Koebnerization (psoriasis that runs along a scratch)
What disease is associated with guttate psoriasis?
Strep throat
