A frustrated 26-year-old female has sought a referral to a ...

[Frost2351]

A frustrated 26-year-old female has sought a referral to a dermatologist in an effort to resolve her sweating and body odor that persists despite good hygiene.
 
  Which of the following facts would underlie the explanation that her physician provides about her problem?
  A)
  Sebaceous secretions vary in both quantity and constituency between individuals.
  B)
  Excess production by eccrine sweat glands, combined with bacteria, produces a characteristic odor in moist areas of the body.
  C)
  Apocrine sweat glands produce a substance that is more oily than sweat from other sources.
  D)
  Occlusion of sebaceous glands in the axillae and groin results in proliferation of microorganisms.

Question 2

A 13-year-old girl has presented to a clinic with her mother explaining that she had an oval-shaped red patch on her chest a week ago but that more of the lesions are now appearing on her back.
 
  On examination, the lesions on her back are in a Christmas tree pattern. What is the girl's most likely diagnosis?
  A)
  Lichen planus
  B)
  Pityriasis rosea
  C)
  Rosacea
  D)
  Melasma

[JYan]

Answer to Question 1

Ans:
C

Feedback:

Body odor is the result of apocrine sweat gland secretions combining with bacteria to produce a characteristic odor. Neither eccrine sweat glands nor sebaceous glands are primarily involved.

Answer to Question 2

Ans:
B

Feedback:

The characteristic lesion of pityriasis rosea is an oval macule or papule with surrounding erythema. This initial lesion is a solitary lesion called the herald patch and is usually on the trunk or neck. As the lesion enlarges and begins to fade away (2 to 10 days), successive crops of lesions appear on the trunk and neck. The lesions on the back have a characteristic Christmas tree pattern. The girl's history and symptomatology are not characteristic of lichen planus, rosacea, or melasma.