Dermatology Flashcards
Which two rashes spare the inguinal folds?
- Contact dermatitis
- Eczema
Which diaper rashes go into inguinal folds?
- Candida
- Psoriasis
- LCH rash
What does nummular eczema look like?
- Coin shaped eczematous lesions on extensor surface of extremities
- Lesions are uniform without central clearing
- Lesions may ooze, crust, or have scales on them
What is Pityriasis Alba?
The hypopigmented skin after seborrheic dermatitis clears
What is the Auspitz sign?
The bleeding that occurs after a psoriasis scale is removed
What differentiates an LCH rash from eczema?
Petechiae or papules in the rash
What are the clinical findings of lichen sclerosus?
- White and scaly
- Chronic, inflammatory, dry, white
- No thickening or sclerosis
- In genital area
- pruritis
What are the clinical features of lichen stratus?
“Striae are linear.”
- Looks like eczema
- Linear or papular and can follow lines of Blaschko
What are the clinical features of icthyosis vulgaris?
“Icky fishy scales”
- Rash resembles fish scales
- Often seen in atopic dermatitis
What are the clinical features of lamellar icthyosis?
“Don’t lament over the lamellar baby, though they look quite alarming. They are not as sick as the harlequin babies.”
- Thin, transparent film over body
- Missing eyelashes
- Everted eyelids
What are the clinical features of harlequin icthyosis?
- Hard, armor-like, horny covering
- Restricted movement
- Poor prognosis
What is pyoderma gangrenosum?
- Pyoderma is associated with Preexisting diseases
- Deep bluish necrotic and boggy looking ulcers
What is granuloma annulare?
- Chronic skin condition
- Annular lesions
- Slightly pruritic
- No scales
- Tx: steroids
What are the main clinical features of Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN)?
- TEN if >30% body surface is involved
- Bullae followed by a hemorrhagic crusting
- Severe blistering -> Nikolsky sign
- Bull’s-eye or target lesion
- At least two mucous membranes involved (usually lips and eyes)
- Rash begins within 2 months of starting implicated medications
What are the main clinical features of erythema multiforme?
- Target lesions start on hands or feet and then progress to trunk
- 0-1 mucous membranes involved
What are the major clinical features of scleroderma?
- Thickened skin with ivory or waxy appearance
- Girls affected more than boys
- Tx: topical lubricants for limited cases, immunosuppression for more severe cases
What is an epidermoid cyst?
- Saclike growth present at birth
- Contain hair and teeth
- Often associated with tufts or sinuses
- Should be removed because they can get infected
How is comedonal acne treated?
- Retinoid
- Benzoyl peroxide, but not to be used at the same time as the retinoid
How is inflammatory acne different from comedonal acne?
Inflammatory acne has a red base
How is inflammatory acne treated?
- Minor cases: localized with small lesions
- Topical antimicrobial: benzoyl peroxide, clindamycin, erythromycin
- Retinoic acid topical
- Severe cases: large, nodular, multiple areas
- Oral antibiotics:
- First line: tetracycline, doxycycline, erythromycin
- Second line: Minocycline
- OCPs
- Isotretinoin
- Oral antibiotics:
What diseases are associated with peg teeth?
Incontinentia pigmenti
Hypohidrotic ectodermal dysplasia