Benign Skin Lesions Flashcards Preview

Week 44: Rash > Benign Skin Lesions > Flashcards

Flashcards in Benign Skin Lesions Deck (12)
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1

Seborrheic keratosis

Well circumscribed, stuck on
Waxy texture
Verrucous, granular, or crumbly surface
Variable size, shape, colour
Can have keratin plugs or horn pearls
Can get inflamed and become itchy or painful
No sebaceous gland involved - its epidermal hyperproliferation (hyperkeratosis)

2

What is the difference between
1. Parakeratosis
2. Orthokeratosis

1. Retention of nuclei in the stratum corneum
2. Hyperkeratosis without nuclei (normal)

3

Epidermoid cyst

Cystic, firm - pore that is plugged by keratin
Yellow (but can be blue/grey if the keratin is oxidized)
Look for the pore!
May become inflamed and infected

4

3 types of melanocytic nevi (what are they formed by)

1. Junctional (melanocytes localized to junction between epidermis and dermis - medium to dark brown, macular)
2. Compound (melanocytes at junction and in dermis - brown to skin coloured, papular)
3. Intradermal (melanocytes localized to dermis - skin coloured to light brown, papular)

5

Hypertrichosis

Hair in mole
Has no positive or negative correlations with it

6

Blue nevus

Dark blue-grey macule or papule
Well circumscribed
Melanin localized to dermis
Common on nose and scalp

7

Acrochordon

Skin tag - epidermis and dermis
Skin coloured to brown pedunculated papules
Usually multiple
1-5 mm
Flextures (neck, axillae, groin, eyelids)
No associated with internal disease

8

Dermatofibroma

Fibroblast or histiocyte derived
Skin coloured to brown nodule
Firm, indurated texture
Extremities
Female > male
Dimple sign (puckers when squeezed)

9

Infantile hemangioma

Benign overgrowth of endothelial cells
Common
Congenital
Red plaques or nodules
Self regressing over months to years (50% gone by 5, 90% gone by 9)

10

Cherry angioma

Bright red papule
1-4 mm
Usually multiple
Adults

11

Lipoma

Subcutaneous nodule
Skin coloured
Firm, rubbery texture
Mobile
Sometimes painful

12

Neurofibroma

Tumor of the supporting cells around the neuron
Soft fleshy papule or plaque
Often pedunculated
Usually asymptomatic
Solitary or multiple