Urticaria Flashcards
name the term that means increased thickness of the keratin layer
hyperkeratosis
name the term that means increased turnover of keratinocytes
parakeratosis
name the term that means increased thickness of the epithelium
acanthosis
define papillomatosis and name a condition it is found in
irregular epithelial thickening
found in acanthosis nigricans
define spongiosis
oedema between keratinocytes
in psoriasis, what is the basic pathology?
parakeratosis in the corneal layer
what is meant by the Koebner phenomenon?
trauma to a site of the body can stimulate skin lesions in that area
true or false: neutrophils are present in the corneal layer in psoriasis
true
unusual though
what is Auspitz sign in psoriasis?
bleeding spots when psoriasis scales are scraped off
where does acne vulgaris tend to affect?
sites of high sebaceous gland concentration
how does sebum lead to acne?
sebum builds up in the hair follicle and increases pressure, leading to rupture
what are comedones?
keratin and sebum build up in the hair follicles, creating white/black heads
true or false: rosacea is more common in males
false
what are the facial features of rosacea?
flushing
visible blood vessels
pustules
thickened skin
list some triggers of rosacea
alcohol
sun
spicy food
stress
which mites are often present in rosacea?
demodex mites
name three immunobullous diseases
pemphigus
bullous pemphigoid
dermatitis herpetiformis
what is the most common subtype of pemphigus?
pemphigus vulgaris
what happens in pemphigus vulgaris?
IgG antibodies are made in response to desmoglein 3
this is the glue that maintains desmosomal attachments
in bullous pemphigoid, where does the blistering develop?
underneath the epidermis
true or false: acanthylosis occurs in bullous pemphigoid
false
what is acanthylosis?
loss of desmosomal attachments in the epidermis
what happens in bullous pemphigoid?
IgG produces antibodies against hemidesmosomes
this causes the epidermis to separate from the basement membrane
what GI disease is linked to dermatitis herpetiformis?
coeliac disease