Fungal and Parasitic Diseases of the Skin

Question 1

Tinea pedis:

Answer 1

• Athlete’s Foot
• Fungal
• Itchy interdigital maceration -> may allow for secondary bacterial infections to occur

Question 2

Tinea cruris:

Answer 2

• Jock itch
• Often seen in those with athletes foot
• Upper thigh but rarely scrotum
• Scaly pustular or vesicular; well defined border

Question 3

Tinea corporis:

Answer 3

• Ring worm
• Anywhere on the body
• Central clearing lesions
• Diabetics susceptible to more extensive episodes

Question 4

Tinea capitis:

Answer 4

• Scalp ring worm
• Invasion of the hair shaft
• Allopecia with black dots -> broken hair shaft
• Kerion: nodular lesion (looks like ulcer) that forms from extreme inflammation

Question 5

Tinea faciei:

Answer 5

• Red scaly on the face

- Tinea barbae in men if beard region

Question 6

Tinea barbae:

Answer 6

-Can be superficial or inflammatory

Question 7

Tinea unguium:

Answer 7

-Strictly the nail infected

Question 8

KOH Tinea:

Answer 8

-Long Narrow septated and branching hyphae

Question 9

How long to treat tinea:

Answer 9

-Treat up to one week after rash has subsided

Question 10

Tinea versicolor:

Answer 10

• Fungal
• Not Tinea genus
• Hypo- or hyperpigmented scaling patches on chest and back
• KOH: Spaghetti and Meatballs; Fungal spores and short cigar butt hyphae
• Wood’s Lamp: Orang yellow fluorescence

Question 11

Pityriasis rosea:

Answer 11

• Not Fungal
• Initial lesion -> HERALD PATCH
• Develops after viral infection

Question 12

Candida albicans:

Answer 12

• Yeast not dermatophyte
• May involve any part of the body
• Antibiotics, oral contraceptives, diabetes, immunosuppression are risk factors
• Most are mucocutaneous infections

Question 13

Angular cheilitis:

Answer 13

• Candida infection of the corner or the lips

- Riboflavin deficiency risk factor

Question 14

Everything candida can cause:

Answer 14

• Vulvovaginitis
• Intertrigo
• Angular cheilitis
• Oral Thrush
• Candidal paronychia

Question 15

Rocky Mountain Spotted Fever:

Answer 15

• Centripetal Rash

- DOXYCYCLINE ALWAYS even if child or pregnant

Question 16

Flea Bites:

Answer 16

• Often found on knees or legs of children

- Bites are in grouped vesicles and random

Question 17

Bed Bug Bites:

Answer 17

• Nocturnal feeders
• Face neck arms hands
• Lesions are in a row not random

Question 18

Lice:

Answer 18

• Pediculus humanus capitis
• Pediculus humanus corporis
• Pediculus pubis

Question 19

Scabies:

Answer 19

• Entire life cycle is in the human epidermis
• Web of fingers, wrist, shaft of penis most common
• Scaly skin
• May see burrowing -> thin linear structure

Question 20

Black Widow:

Answer 20

• Neurotoxin
• Lactrodectism: lymph and vascular dissemination of venom
• Abdominal, back and leg pain most common

Question 21

Brown Recluse:

Answer 21

• Bites will induce necrotic slow healing lesions

- Severe bites become necrotic in 4 hours

Question 22

Cutaneous larva migrans:

Answer 22

• Any larva that enters skin migrates and dies bc human is a dead end host
• Serpiginous migratory lesion

Question 23

Seabather’s Eruption:

Answer 23

• Larvae of the thimble jellyfish -> FL and Caribbean

- Rash where bathing suit was