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1. A patient presents with a rash, characterized by red macules and edematous
papules with a clearing center. This best describes which of the following?
A erythema marginatum
B erythema multiforme
C varicella
D impetigo: B
Target lesions, also termed iris lesions, are characteristic of erythema multiforme. The rash may be recurrent but typically
resolves over 3-6 weeks.
2. In a patient suspected of having seborrheic dermatitis, the most common site
of involvement would be the
A upper extremities.
B thighs
C scalp.
D feet.: C
The most common site of involvement of seborrheic dermatitis is the scalp. Other common sites include the eyebrows,
eyelids, nasolabial fold, and ears
3. A 26 year-old male complains of intense itching, especially at night and after
hot showers, for the past 4 days. On physical examination he has a few red
papules and areas of excoriation on his volar wrists, between his fingers, and
around his waist. Proper diagnosis should include which of the following tests?
A KOH prep
B Gram stain
C Skin scraping microscopy
D Tzanck prep: C
The history and exam is consistent with a scabies infection. Scrapings from the burrows should be examined for the
presence of mites, eggs, and feces.
4. A 35 year-old female who recently returned from a backpacking trip com-
plains of fatigue, malaise, fever, chills, and arthralgias. Physical examination
reveals a 6 cm annular lesion with a red border and a clear center on her
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mid-back. Which of the following laboratory tests would support your diagno-
sis?
A KOH prep of skin scrapings
B Blood cultures
C RAST testing
D Serologic antibody testing: D
Most people with Lyme Disease will have a positive serologic test after the first few weeks of infection and this would
support the diagnosis.
5. A 56 year-old, right hand dominant, carpenter presents to your clinic com-
plaining of a prolonged bruise under his left thumbnail. He states that he first
noticed it one year ago. Physical examination reveals a nontender left thumb
with a 6 mm macular lesion located under the distal nail bed. It is mixed dark
brown and black in color, with irregular borders. The most likely diagnosis is
A lentigo.
B trauma.
C melanoma.
D nevus: C
Acral lentiginous melanoma may occur on the palm, sole, nail bed, or mucus membrane. This lesion is suspicious for a
melanoma due to its irregular borders, being variegated in color, and its size. A biopsy is required and will ensure the
diagnosis.
6. A mother brings in her 2 year-old child stating that the child has had a 3-day
history of a nonproductive cough, thick copious rhinorrhea, conjunctivitis, and
a fever to 103 degrees. Physical examination reveals a well-hydrated child, with
numerous 1-2 mm white papules on both buccal mucosa, normal heart and
breath sounds. This presentation is most consistent with early
A rubeola.
B rubella.
C varicella.
D streptococcal pharyngitis: A
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Rubeola (measles) is characterized by cough, coryza, and conjunctivitis, along with a fever as a prodrome. Koplik spots
appear prior to the onset of the typical erythematous, maculopapular rash and are pathognomonic for rubeola.
7. A person with atopic dermatitis should be advised to
A avoid cutaneous irritants.
B take hot water baths or showers
C use a high potency glucocorticoid on skin after bathing.
D begin a prophylactic antibiotic.: A
Avoidance of cutaneous irritants, such as wool and other rough clothing, is the cornerstone of therapy for atopic
dermatitis.
8. An elderly woman presents to your clinic complaining of unilateral facial pain
and painful lesions. She also complains of blurred vision in the ipsilateral eye.
On examination she has several vesicles on an erythematous base, some of the
lesions with crusts. They are distributed in a dermatomal pattern and involve
the skin overlying the maxillary region and the tip of her nose. Which of the
following is the next most appropriate intervention in the care of this patient?
A KOH prep
B Culture for bacteria
C Referral to an ophthalmologist
D Application of corticosteroids: C
Immediate referral to an ophthalmologist is needed when herpes keratitis is suspected, as in this case. A fluorescein
stain of the eye might reveal the typical dendritic corneal lesion.
9. A 28 year-old female with diabetes mellitus type 2 sustains a partial thickness
burn to her left upper arm and her chest when hot grease spilled on her at
home. The burn to her arm is circumferential and the estimated total body
surface burned is 18%. She has no allergies. The most appropriate treatment
of this patient would include
A outpatient application of silver sulfadiazine.
B debridement of all intact blisters.
C IV cefazolin (Ancef, Kefzol).
D transfer to a burn center.: D