Cutaneous fungal Infections Flashcards

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1
Q

Which 3 types of fungi commonly cause skin infection?

A

Dermatophytes: Tinea (Ringworm)
Yeasts: Candida albicans
Moulds: Aspergillus

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2
Q

2 common features of fungal skin infection presentation

A

Itchy

Unilateral/ asymmetrical

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3
Q

3 features of Tinea Pedis

A

Most common dermatophyte infection
Moist scaling + fissuring in toe-webs
Spreads to sole + dorsum of foot

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4
Q

How is dermatophyte infection most commonly acquired?

A

Contact with keratin debris carrying fungal hyphae

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5
Q

3 features of Tinea Cruris

A

M > F
Scaly erythematous margin spreads down medial thighs, may extend back to perineum + bum
Source often feet

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6
Q

2 features of Tinea Corporis

A

Clearly defined raised, scaly edge

Annular lesions on trunk + limbs

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7
Q

Presentation of Tinea Manuum

A

Palm: mild scaling erythema
Dorsum: inflammatory change with well defined edge

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8
Q

3 features of Tinea Unguium

A

Common + associated with athletes foot
Starts distally with yellow streaks in nail plate
Whole nail thickens, discolours, friable

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9
Q

4 features of Tinea Capitis

A

Kids > Adults
>,1 patches of partial hair loss
Scaly + hair broken off just above surface
+/- Inflammation/ pustule formation

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10
Q

3 features of Kerion

A

Severe inflammatory scalp ringworm
Pustules + Abscesses
Often fungus of Cattle ringworm

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11
Q

3 features of Cattle ringworm

A

Affects face + forearms
Marked inflammatory reaction
Young farmers/ kids visiting farms at risk

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12
Q

3 features of Tinea Incognito

A

Fungal infection appearance altered by inappropriate tx with topical steroids
Top. steroids suppress inflammatory response to fungus
Scaly erythematous margin disappears leaving ill-defined patchy scaling erythema studded with pustules

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13
Q

Ix for suspected dermatophyte infection

A

Skin scrapings, nail clippings + plucked hair

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14
Q

Tx for dermatophyte infection

A

Small: Terbinafine TOP

Extensive/ Nails: Terbinafine PO

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15
Q

Tx for tines capitis

A

1: Griseofulvin PO (Safe for kids)
2: Terbinafine/ Itraconazole PO

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16
Q

Aetiology of Candida albicans infection

A

Normal commensal
Pathogenic when favourable conditions to multiplication arise e.g. Immune suppression, Steroids, Broad spectrum Abx, DM, apposition of skin to warm moist environment

17
Q

Ix for candidiasis

A

Swab + culture

18
Q

2 features of buccal mucosal candidiasis

A

White, curd-like plaques adhere to buccal mucosa

Scraped off to reveal inflamed + friable epithelium

19
Q

Tx for buccal mucosal candidiasis

A
Miconazole gel
Fluconazole PO (Severe)
20
Q

What inflammation process at the corners of the mouth may be caused by Candida?

A

Angular chelitis

21
Q

Tx for Candidal angular chelitis

A
Miconazole TOP / Nystatin
Fluconazole PO (Severe)
22
Q

What is chronic Candidal paronychia? Who does it predominantly occur in?

A

Inflammatory process affecting proximal nail fold + nail matrix
Those whose hands are repeatedly immersed in water

23
Q

3 features of chronic Candidal paronychia

A

Thickening + erythema of proximal nail fold- Bolstering
Loss of cuticle- access of irritant substances
Associated nail dystrophy

24
Q

Tx for chronic Candidal paronychia

A

Keep hands dry as poss

Miconazole TOP

25
Q

Presentation of balanitis

A

Small white patches/ eroded areas on foreskin/ glans

26
Q

3 risk factors for balanitis

A

Poor penile hygeine
DM
Sexual partner with candida vulvovaginitis

27
Q

Presentation of vulvovagintis

A

Creamy discharge

Itchy erythema of vulva

28
Q

3 risk factors for vulvovaginitis

A

Pregnancy
OCP
DM

29
Q

Tx for balanitis

A

Ketoconazole/ Miconazole TOP

30
Q

Tx for vulvovaginitis

A
  1. Fluconazole PO

2. Clotrimazole PV

31
Q

Intertrigo

A

Maceration which occurs when 2 skin surfaces are in apposition
Groins, Axillae, Submammary regions, beneath abdominal fat apron
RF: Obesity + poor hygeine

32
Q

What suggests candida super infection in Intertrigo?

A

Creamy ‘satellite’ pustules at margins of affected areas

Easily rupture leaving collarette of scale + scalloped edge

33
Q

Tx for Intertrigo

A

Terbinafine/ Imidazole TOP
Hydrocortisone TOP
Hygiene

34
Q

2 features of Pityriasis versicolor

A
YA most commonly
Malassezia yeasts (commensals in pilosebaceous follicles)
35
Q

Presentation of Pityriasis versicolor

A

Asymptomatic
Fair: Light-brown macules with fine surface scale, trunk + upper arms
Dark: Patchy hypopigmentation

36
Q

Ix for Pityriasis versicolor

A

Skin scrapings + microscopy

37
Q

Tx for Pityriasis versicolor

A

Limited: Clotrimazole cream
Extensive: Ketoconazole shampoo