Fungal Skin Infections Flashcards
What is ringworm
a dermatophyte infection also known as tinea
Dermatophyte definition
fungal organisms that require keratin for growth
scalp ringworm
tinea capitis
beard ringworm
tinea barbae
body ringworm
tinea corporis
hand ringworm
tinea manuum
nail ringworm
tinea enigma
groin ringworm
tinea cruris
foot ringworm
tinea pedis (athlete’s foot)
presentation of ringworm
round, scaly, itchy lesions where the edge is more inflamed than the centre
describe the pathogenesis of a dermatophyte infection
fungus enter abraded or soggy skin
hyphae spread in stratum corneum
infects keratinised tissues only
increased epidermal turnover causes scaling
inflammatory response provoked
hair follicles and shaft evaded
lesions grows outwards and heals in the centre, giving a ‘ring’ appearance
Ix for tinea infection
Skin scrapings
woods light
Tx of tinea infection
Topical antifungal - clotrimazole, imidazole
If un-resolving
- oral antifungal - terbinafine
What is pityriasis versicolour
superficial fungal infection of the stratum corneum
MAin causative fungus of pityriasis versicolour
Malassezia - normal skin flora that colonises the stratum corneum
