Derm Dx

Question 1

Eczematous dermatitis

Answer 1

UK Working Party’s Criteria

Question 2

Drug eruptions (fixed)

Answer 2

Confirmed by punch biopsy

Question 3

Lichen planus

Answer 3

Clinical presentation Punch biopsy

Test for HepC

Question 4

Pityriasis rosea

Answer 4

Clinical KOH prep r/o fungus RPR

Question 5

Psoriasis

Answer 5

Clinical Labs to r/o RA
Path: acanthosis w/ regular elongations of rete ridges “test tubes in a row”
Koebners

Question 6

Erythema multiforme

Answer 6

Clinical Skin biopsy when uncertain

Question 7

Stevens - Johnson syndrome

Answer 7

Biopsy

Question 8

Toxic epidermal necrolysis

Answer 8

Biopsy

Question 9

Bullous pemphigoid

Answer 9

Biopsy, ELISA Immunofluorescence

Question 10

Acne vulgaris

Answer 10

Evaluate hyperandrogenism in F if other s/s

Mild: comedones +/- a few pustules Mod: comedones + lots of pustules/papules Severe: nodules (>5mm) or cysts

Question 11

Rosacea

Answer 11

Persistent central face erythema for 3+mo Other clinical s/s

Question 12

Actinic keratosis

Answer 12

Biopsy

Question 13

Basal cell carcinoma

Answer 13

Punch or shave biopsy

Question 14

Melanoma

Answer 14

Full thickness wide excisional biopsy + lymph node biopsy

Question 15

Squamous cell

carcinoma

Answer 15

Biopsy

Question 16

Lice

Answer 16

Comb/visualization (nits at base of hair shaft) Live nits fluoresce under wood’s lamp

Question 17

Scabies

Answer 17

Look for mites, eggs, or feces in scraping under microscope

Question 18

Spider bites

Answer 18

BW: pain @ bite site .5-2hrs, Muscle pain/spasms/rigidity lasting 1-3 days BR:burning, morbilliform rash- erythema at bite site 3-4 hrs ->blanching (vasoconstriction)-> red halo-> hemorrhagic bullae forms eschar-> necrosis in 10%

Question 19

Condyloma acuminatum

Answer 19

Application of acetic acid Colposcopy Biopsy Pap smear HPV DNA detection

Question 20

Viral exanthem (Rubeola)

Answer 20

Rash lasts 7d +/- fever w/ rash

Question 21

Viral exanthem (Rubella)

Answer 21

Clinical Specific IgM antibody

Question 22

Viral exanthem (5th Dz)

Answer 22

Serologies

Question 23

Herpes simplex

Answer 23

Clinical

Question 24

Molluscum contagiosum

Answer 24

Clinical

Question 25

Varicella -zoster

Answer 25

Clinical

Question 26

Verrucae

Answer 26

Cl8nical

Question 27

Cellulitis

Answer 27

H+P Gram stain and Cx WBC ESR Blood Cx X-ray, MRI, CT

Question 28

Erysipelas

Answer 28

H+P Gram stain and Cx WBC ESR

Question 29

Impetigo

Answer 29

Clinical Diagnosis: Highly contagious May have pruritus/pain. Usu no systemic sx’s Nonbullous: MC type. macules/papules→ vesicles/pustules, honey-colored crust. MC on face and extremities Bullous: Exfoliative s aureus A/B toxins. Vesicles enlarge to form bullae. MC on trunk Ecthyma: Infection into dermis

Question 30

Candidiasis

Answer 30

MC moist, macerated areas Pruritic rash, beefy red erythema w/ distinct, scalloped borders & satellite lesions

Question 31

Tinea Capitis

Answer 31

Scaly patches w/ alopecia, pruritus, pustules, scarring

Question 32

Tinea corporis

Answer 32

Erythematous plaques scaling cracking vesicles

Question 33

Tinea cruis

Answer 33

Diffuse red rash on grain or scrotum

Question 34

Tinea pedis

Answer 34

Pruritic scaly eruption rash between toes or hyperjeratosis on soles, medial lateral surface of feet or vesiculobullous on medial feet

Question 35

Onychomycos is

Answer 35

Opaque, thickened, discolored, and cracked nails w/ subungual hyperkeratinization

Question 36

Pityriasis veriscolor

Answer 36

``` Persistent rash w/o tx Hyper/hypo-pigmented, well-demarcated round/oval macules w/ fine scaling, can coalesce into patches, involved skin doesn’t tan. KOH prep (hyphae & spores “spaghetti & meatball” Woods lamp -yellow-green fluorescence ```

Question 37

Alopecia areata

Answer 37

Exclamation point hairs

Question 38

Onychomycosis

Answer 38

Opaque, thickened, discolored, and cracked nails w/ subungual hyperkeratinization

Question 39

Acanthosis nigricans

Answer 39

Clinical

Question 40

Burns

Answer 40

1st: cap refill intact, blanches 2nd: cap refill intact, blanches 3rd: Absent cap refill 4th: Absent

Question 41

Hidradenitis suppurativa

Answer 41

Clinical

Question 42

Lipomas / Epithelial inclusion cysts

Answer 42

Clinical Nothing!!!

Question 43

Melasma

Answer 43

Hyperpigmentation of face

Question 44

Pilonidal Dz

Answer 44

Butts

Question 45

Pressure ulcers

Answer 45

Stage I: Superficial, nonblanchable redness that does not dissipate after pressure is relieved. Stage II: Epidermal damage extending into the dermis. Resembles a blister or abrasion Stage III: Full thickness of the skin and may extend into the sub-q layer Stage IV: Deepest. Extends beyond the fascia, extending into muscle tendon or bone

Question 46

Urticaria

Answer 46

Clinical

Question 47

Vitiligo

Answer 47

Clinical Koebner phenomenon