Y5 - Benign skin lesions (incl. dermatofibroma, seborrhoeic keratoses) Flashcards Preview

Year 5 Dermatology > Y5 - Benign skin lesions (incl. dermatofibroma, seborrhoeic keratoses) > Flashcards

Flashcards in Y5 - Benign skin lesions (incl. dermatofibroma, seborrhoeic keratoses) Deck (29)
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1
Q

def of dermatofibroma

A

benign skin growth

2
Q

dermatofibroma is AKA

A

benign fibrous histiocytomas

3
Q

signs and symptoms of BFH

A

hard solitary slow-growing papules (rounded bumps)

usually nothing, but sometimes itching and tenderness

4
Q

what colour are BFH

A

tanned/brownish colour

5
Q

what sign is BFH associated with

A

dimple sign

6
Q

what is dimple sign

A

applying lateral pressure causes a central depression of the dermatofibroma

7
Q

where are dermatofibromas most commonly found

A

on the legs and arms

8
Q

epi of BFH

A

women>men

young adults

9
Q

aetiology of BFH

A

possibly related to previous injuries (insect bites or thorn pricks)
causing disordered collagen to be laid down by fibroblasts

10
Q

what is the positive buttonhold sign

A

central dimpling in the center of BFH

11
Q

what are dermatofibromas

A

positive for stromelysin-3, and factor XIIIa

12
Q

management for BFH

A

usually none

13
Q

prognosis of BFH

A

excellent

some may suffer from pain or itching

14
Q

physical examination of a BFH

A

solitary <1cm nodule

15
Q

def of SK

A

a common, multiple, benign skin tumour

16
Q

where is SK commonly found

A

on the torso

17
Q

epi of SK

A

middle age

vvv common

18
Q

what do SK look like

A

circumscribed grey/brown/black plaques with a stuck on appearance

19
Q

aetiology of SK

A

clonal expansion of mutated epidermal keratinocytes by unknown cause
possibly associated with chronic UV damage

20
Q

what mutations are involved in SK

A

FGFR3 mutations

21
Q

signs and symptoms of SK

A
  • ‘stuck on’ lesions
  • on face or torso
  • yellow-dark brown
  • slightly raised lesion with a wart like texture
22
Q

RFs of SK

A

older
white
FHx

23
Q

investigations of SK

A

dermoscopy
-milia-like cysts and comedo-like openings
biopsy and histopathological examination
-sharply defined exophytic lesions

24
Q

management of SK

A
for itchy lesions
-corticosteroids (betamethasone)
for raised SK
-curretage or cautery
for flat SK
-cryotherapy
25
Q

which is used more curretage or cautery

A

curretage as leaves no scars

26
Q

what is used for cryotherapy

A

liquid nitrogen

27
Q

complications for SK

A

irritation and itching

28
Q

prognosis

A

good

29
Q

what is ammonium lactate useful for

A

reducing height of SK