Week Three - Skin Tags, Dermatofibroma, Nevi, and Seborrheic Keratosis

Question 1

When irritated or injured, a skin tag may appear as a necrotic, crusted papule that may not be clinically distinctive and may raise concern regarding a ______

Answer 1

• Malignancy

Question 2

*The easiest means of removal of a skin tag is by _____ using ______ and ______

Answer 2

• Lift-and-snip
• Scissors
• Forceps

Question 3

The diagnostic test, “dimple sign,” if positive suggests a ______

Answer 3

• Dermatofibroma

Question 4

______ _______ is usually sufficient for removal of a dermatofibroma, along with a biopsy if indicated

Answer 4

• Full-thickness excision

Question 5

Characteristically, on compression, a ________ demonstrates a “buttonhole” sign

Answer 5

• Neurofibroma

Question 6

Cafe-au-lait spots (light brown macules) are a cutaneous finding often seen in ______

Answer 6

• von Reckinghausen’s

Question 7

Over time, moles tend to mature from _____ to _____ and then _____ types

Answer 7

• Junction
• Compound
• Dermal

Question 8

Most nevi are acquired, appearing sometime after the _____ year of life and before age ____

Answer 8

• First

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Question 9

Regular brown color, surface, and border are characteristic features of a nevus that differentiate it from ______

Answer 9

• Melanoma

Question 10

A blue nevus is similar in appearance to the more serious diagnosis of _____

Answer 10

• Nodular melanoma

Question 11

Weeks to months after incomplete removal of a nevus, brown macular re-pigmentation may appear in the scar and a biopsy specimen taken from that lesion may confuse the pathologist with a _______

Answer 11

• Melanoma (pseudomelanoma)

Question 12

A small percentage of small dark dots within melanocytic nevi are due to _____

Answer 12

• Melanoma

Question 13

What are the four signs that help distinguish a normal mole from a melanoma?

Answer 13

• Asymmetry
• Border
• Color
• Diameter

Question 14

There is a large risk of _____ in newborns with nevi covering more than 5% of the body surface

Answer 14

• Melanoma

Question 15

Are moles that have changed in color, shape, or size; have been acquired in adulthood; bleed; or are itching worrisome?

Answer 15

• Yes

Question 16

What are the differences between common and atypical moles?

Answer 16

Common Nevi

• Usually sun-exposed areas, often above the waist
• Absent at birth
• Usually less than 6mm
• Uniform color

Atypical Moles

• Appear in sun-protected areas
• Appear as normal nevi at ages 2-6, increase in number and size during puberty, new nevi appear throughout life
• Irregular border, margins fade into skin
• Color is variable within a single lesion

Question 17

What are the three physical characteristics common to all seborrheic keratoses?

Answer 17

• Well-circumscribed border
• Stuck-on appearance
• Variable tan-brown-black color