Dermatology Flashcards
What is “rodent ulcer” another name for?
Basal cell carcinoma
What are the 2 risk factors to remember for basal cell carcinoma?
Sun exposure
Gorlin’s syndrome
Where do basal cell carcinomas tend to present?
Face, scalp, ears + trunk
What are the 3 types of basal cell carcinoma and which of these is most common?
Nodular-ulcerative (most common)
Morphoeic
Superficial
How do nodular-ulcerative BCCs appear?
Translucent
Pearly edges
Telagiectasia
Describe the appearance of morphoeic BCCs
Reddish, small, may have telangiectasia, often near nose
Describe the appearance of superficial BCCs
pink/brown scaly plaque
Define contact dermatitis
Inflammatory skin disease
Allergic or irritant stimulus
Stimulus is external
Where does contact dermatitis usually present?
Hands
Recall the appearance of a contact dermatitis rash
Redness
Vesicles/papules
Define eczema (exactly)
A pruritic papulovesicular skin reaction to endogenous or exogenous agents
Recall 3 signs of acute eczema
Excoriation
Papules
Vesicles
Recall 3 signs of chronic eczema
Lichenification
Thickened epidermis
Fissures
Differentiate atopic and seborrhoeic eczema
Atopic: erythematous; face and flexures
Seborrhoeic: Yellow and greasy; eyebrows and scalp
What investigation should be done in suspected atopic eczema?
IgE levels
Define erythema multiforme
Acute hypersensitivity reaction of skin and mucous membranes
What is a severe form of erythema multiforme known as?
Stevens-Johnson syndrome
Recall the aetiology of erythema multiforme
Degeneration of basal epidermis –> vesicles form between basal epidermal cells –> lymphocyte infiltration
What is the cause of erythema multiforme?
50% of the time there is a precipitating factor
Recall 3 symptoms of erythema multiforme (quite unusual!)
- May have prodromal URTI
- Lesions appear suddenly and itch
- When lesions fade they may leave an area of hyperpigmentation
Describe the appearance of skin lesions in erythema multiforme
Like targets, symmetrical
Where is the most common site of erythema multiforme skin lesions?
Limbs
Define erythema nodosum
Panniculitis leading to red or violet subcutaneous nodules
What is panniculitis?
Inflammation of subcutaneous fat
In what demographic is erythema nodosum most common?
Young females