Lecture 5 Skin Infections and Infestations

Question 1

What aerobic cocci live on our skin

Answer 1

• Staphylococcus epidermidis

* Staphylococcus aureus

Question 2

What other aerobic and anaerobic bacteria live on the skin

Answer 2

• Corynebacterium

* Propionbacterium

Question 3

What yeasts live on the skin

Answer 3

Malassezia furfur

Question 4

Signs of infection

Answer 4

Tender
Hot
Erythema 
Pus
Exudate
Fever

Question 5

What is Impetigo

Answer 5

Superficial skin infection

Most common bacterial skin infections

Question 6

Clinical features of Impetigo

Answer 6

Bullous
Golden crust
Can spread

Question 7

What are the causes of Impetigo

Answer 7

– Staphylococcus aureus, Streptococcus pyogenes

Question 8

What is the treatment for Impetigo if localised

Answer 8

Fusidic acid cream (5 days)
Mupirocin cream (5 days)

Question 9

What is the treatment for Impetigo is if is widespread

Answer 9

Flucloxacillin oral (7 days)
Erythromycin oral (7 days)

Question 10

Clinical features of Oedema blisters

Answer 10

• Acute exacerbation of oedema
• Dorsum of feet
• Often erythematous
• Can feel hot

Question 11

Treatment for Lipodermatosclerosis

Answer 11

• treat underlying venous disease

* topical steroids

Question 12

Name types of fungal infections

Answer 12

• Tinea

* Candidiasis

Question 13

What is the causative agent of Tinea

Answer 13

Infection by dermatophyte

Question 14

If Tinea is on the body what is it called

Answer 14

Tinea corporals

Ringworm

Question 15

if Tinea is on the scalp what is it called

Answer 15

Tinea capitis

Question 16

If tinea is on the foot what is called

Answer 16

Tinea pedis (athletes foot)

Question 17

Where does Tinea Curtis affect

Answer 17

The groin

Question 18

Whats the treatment for tinea infection

Answer 18

• Terbinafine or clotrimazole cream
• Tinea infection of scalp or nails requires oral antifungals
• Check and treat other family members

Question 19

How are skin scrapings processed

Answer 19

• Inoculated onto primary isolation media
• Sabouraud’s dextrose agar containing cycloheximide
• Incubated at 26-28C for 4 weeks

Question 20

Clinical feature of candida infection

Answer 20

Satellite regions

Question 21

Treatment for candida infection

Answer 21

Nystatin, Miconazole, Ketoconazole cream

Question 22

Precautions for wart infections

Answer 22

Cover wart with waterproof plaster

Low transmission risk

Question 23

Treatment for HPV warts

Answer 23

Not necessary
Paints and Cryotherapy may stimulate immune system
Warts will go away when patient develops immunity to the

Question 24

What is Molluscum Contagiosum

Answer 24

DNA pox virus that causes umbilicate papule

Question 25

Treatment of Molluscum Contagiosum

Answer 25

5% Potassium hydroxide

Induced inflammation and body recognises virus and clears it

Question 26

Causative agent of Scabies

Answer 26

Sarcoptes Scabei

Question 27

Clinical Features of scabies

Answer 27

Burrows
Crusted scabies
Mites
Thick white crust

Question 28

Diagnosis of scabies

Answer 28

Histology

Microscopy

Question 29

Treatment of scabies

Answer 29

 Permethrin cream top to toe for 8 hours

• Two applications 1 week apart