unit 7: podiatric dermatology

Question 1

define Tinea Pedis

Answer 1

tinea pedis is a contagious fungal infection that affects the skin on the pedal aspect and sometimes spreads to toenails or hands

Question 2

define Tinea Pedis

Answer 2

it is a contagious fungal infection that affects the skin on the plantar aspect of the foot and can spread to toenails and sometimes the hands

Question 3

who (gender and age) are more prone to Tinea Pedis

Answer 3

it is common in males and prevalence increases with age

Question 4

name 3 dermatophyte species that cause it

Answer 4

trichophyton rubrum, trichophyton mentagrophytes
epidermophyton floccosum

Question 5

name 2 non-dermatophyte species that cause it

Answer 5

scytalidium dimidiatum and scytolidium hyalinum

Question 6

describe 5 causes of Tinea Pedis

Answer 6

1.sharing of footwear with already infected people
2.swimming and communal bathing
3.a hot,humid and tropical environment
4.occlusive (closed) footwear that causes hyperhidrosis (sweating) & Maceration (lighter and wrinkly skin)
5.poor foot hygiene

Question 7

what causes maceration

Answer 7

maceration is caused by wearing occlusive (closed) footwear and skin becomes in contact with moisture for too long

Question 8

define dermatophyte

Answer 8

dermatophyte is fungi that requires keratin to grow

Question 9

what is keratin

Answer 9

keratin is a protein in epithelial cells that forms rthe outer layer of the skin

Question 10

explain the pathophysiology (physiological process of a disease) of dermatophytes in Tinea Pedis

Answer 10

1.dermatophytes invade the superficial keratin using keratinase

2.dermatophyte cell walls contain mannans which inhibits the body’s immune response

3.mannans reduce keratinocyte proliferation, resulting in a decreased rate of sloughing (shredding old dead skin to replace with new skin cells) and a chronic state of infection (Tinea Pedis) occurs

Question 11

what are the clinical features

Answer 11

itching, stinging burning sensation and presence of associated dermatophyte infections

Question 12

what are 3 associated dermatophyte infections

Answer 12

1.onychomycosis (fungal infection on toe nails)

2.tinea cruris (fungal infection on skin of genitals, inner thighs and buttocks

3.tinea manuum (fungal infection of the hands)

Question 13

is tinea pedis asymetric or symetric

Answer 13

asymetric- doesnt occur on both sides the same way

Question 14

what are the subtypes and explain them