26 - Seborrheic Dermatitis

Question 1

Seborrheic dermatitis usually appears in

Answer 1

Adolescents and young adults

Question 2

Peak incidence of infantile seborrheic dermatitis

Answer 2

3 months

Question 3

Seborrheic dermatitis has a (male/female) preponderance

Answer 3

Male

Question 4

Y/N: Seborrheic dermatitis is often influenced by a seasonal impact.

Answer 4

Yes

Question 5

Seborrheic dermatitis becomes more common and severe in

Answer 5

Cold and dry climates

Question 6

Prognosis of infantile seborrheic dermatitis

Answer 6

Normally resolves spontaneously within the first 6-12 months of life

Question 7

Characterized by desquamative erythroderma, sparse hair, frequent loose stools and failure to thrive

Answer 7

Leiner disease

Question 8

Leiner disease is associated with congenital or acquired deficiencies of

Answer 8

C3, C5

Question 9

Asbestos-like scalp

Answer 9

Pityriasis amiantacea

Question 10

Pityriasis amiantacea is more common in (males/females)

Answer 10

Females

Question 11

Y/N: Alopecia is a common feature of pityriasis amiantacea.

Answer 11

Yes

Question 12

Most frequent skin conditions associated with pityriasis amiantacea

Answer 12

Psoriasis (35%)

Eczematous conditions like SD and AD (34%)

Question 13

A _____ form of Malassezia, a pathogenic form observed in pityriasis versicolor, has not been detected in SD.

Answer 13

Mycelial

Question 14

Most important Malassezia species identified in SD

Answer 14

M. globosa

M. restricta

Question 15

Agonists to aryl hydrocarbon receptor, which is involved in the differentiations of Th 17 cells and the mediation of contact sensitivity

Answer 15

Malassezin

Question 16

Could explain the lack of a positive correlation between the number of Malassezia and the severity of dandruff

Answer 16

Host susceptibility factor

Question 17

SD expressed in Parkinson disease has been thought to result from

Answer 17

Elevated levels of sebum allowing the proliferation of Malassezia

Question 18

SD-like dermatitis also appears in patients with _____ or _____ deficiency

Answer 18

Zinc

Biotin

Question 19

Scalp dermoscopy of psoriasis vs SD

Answer 19

Psoriasis: twisted loop, red dots and globules, glomerular vesses
SD: arborizing vessels, atypical red vessels

Question 20

Diagnostic criteria suggested by Beare and Rook for infantile seborrheic dermatitis

Answer 20

Early onset (before 6 months of age)
Erythematous and scaling rash distributed in the scalp, diaper, or flexural areas
Relative absence of pruritus

Question 21

Has generally more purpuric lesions and tends to desquamate on the scalp and ulcerate on the folds and mucosal areas

Answer 21

Langerhans cell histiocytosis, previously called Letterer-Siwe disease

Question 22

Dandruff aka

Answer 22

Pityriasis simplex capillitii