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Flashcards in Racial differences Dan Deck (20)
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1
Q

T/F

Dark skinned pts have more melanocytes than caucasians

A

False
Number/density of melanocytes the same across races
Amount and type of melanin varies - dark skin have more melanin and darker types of melanin

2
Q

T/F

Europeans have the smallest melanosomes

A

True
Africans largest melanosomes
Europeans smallest

3
Q

T/F

Melanosomes are evenly distirbuted in each keratinocytes in caucasians

A

False
mainly clustered at the nuclear membrane in caucasians
even distribution in africans
mixed pattern in asians

4
Q

T/F

The stratum corneum is of equal thickness across races but has more layers in black skin

A

True

5
Q

T/F

Black skin desquamates 5x more than caucasian skin

A

False

2.5x more

6
Q

T/F

African hair is elliptical with variable diameter along its length – like a twisted oval rod

A

True

7
Q

T/F

caucasian hair is the opposite of african hair

A

False
asian hair is fine and round
caucasian is mix between african and asian types

8
Q

T/F

Caucasians get more pattern baldness than other races

A

True

9
Q

T/F

longitudinal melanonychia occurs in 50% of afrocaribbeans

A

True

10
Q

T/F

Inflammatory skin disease in dark skin types more often causes folliculocentric and annular patterns

A

True

e.g. secondary syphylis

11
Q

T/F

acne is worst in asians

A

False

caucasians

12
Q

T/F

pityriasis rosea is twice as common in black people

A
True
Also;
Scalp more often involved
More itchy and persistent
PI hyperpigmentation common
Often need antihistamines and TCS, may need UVB for black pts
13
Q

T/F

Hypopigmentation is an important feature of seb derm in black people

A

True

14
Q

T/F

vitiligo is more common in dark skin types

A

False
but more noticable
Idiopathic guttate hypomelanosis is more common in dark skin

15
Q

How does MF differ in black skin pts?

A

Darkest skin types (types 5,6) prone to hypopigmented MF
Younger age of onset than classical MF
Hypopigmented MF shows loss of CD7+ cells
Patch stage hypopigmented MF usually indolent and responds well to phototherapy
Black pts present late in tumour stage, have more aggressive disease and poorer prognosis

16
Q

T/F

Traction alopecia and tinea capitis more common in afro-caribbeans

A

True

17
Q

What is Mossy foot?

A

= Podoconiosis
Lymphoedema of feet due to contact exposure to alkali clay soils. Presents in 20s.
Foot hygiene and wearing shows can reverse early changes

18
Q

T/F
The following are skin diseases mainly or exclusively seen in black people
Pseudofolliculitis barbae and acne keloidalis nuchae
Dissecting cellulitis
central centrifugal cicatricial alopecia
acrokeratoelastoidosis, keratosis punctata, pityriasis rotunda
Dermatosis papulosa nigra
Transient neonatal pustular melanosis
Facial afro-caribbean childhood eruption (FACE)
Sickle cell anaemia
HTLV-1 associated infective eczema – Caribbean eczema variant
Ainhum

A

True

19
Q

What is Facial afro-caribbean childhood eruption (FACE) ?

A

multiple small fleshy papules in perioral distribution in black kids age about 8
Cause unknown
Resolves in 3-5 years

20
Q

What are the 4 types of Kaposis sarcoma?

A

Classical – Ashkenazi jews and mediterraneans
Endemic - Africans
Epidemic – AIDS associated
Iatrogenic - in immunosuppressed pts