Non-pigmented Benign Epithelial

Question 0

Large Cell Acanthoma

Answer 0

1. Tan brown plaque

2. Commonly seen on leg

Question 1

Clear Cell Acanthoma

Answer 1

1. Tan pink soft polyp, thickening of epidermis

2. Commonly seen in LE

Question 2

Solar Lentigo/Seborrheic Keratosis

Answer 2

1. Solar Lentigo=pigmented macules –> evolve into seborrheic keratoses (reticulated form)
2. Seborrheic keratosis=evolve from small papules to plaques and nodules; “stuck on” appearance
3. May resemble melanoma when traumatized
4. Seborrheic keratosis is the most common misdiagnosis of melanoma

Question 3

Eccrine (Apocrine) Poroma

Answer 3

1. Feet most common location
2. Solitary, lobulated mass –> pink, fleshy color
3. Easily bleeds

Question 4

Onychomatricoma

Answer 4

1. Most commonly on hallux

2. Benign neoplasm of nail matrix