Question | Answer |
What is the defining feature of Pityriasis Versicolor? | It feeds on sweat and sebum NOT keratin. It is a lipophilic yeast. |
Does Pityriasis cause an inflammatory response? | NO |
What is the physical observation of a person with Pitryiasis Versicolor? | Depigmentation/pigmentation |
What exacerbates Pitryiasis Versicolor? | Humid environments |
What do anti-fungals target? | They are broad spectrum and target ergosterol in the cell wall of fungi. |
What does a skin scraping containing fungi appear like after digestion with KOH. | Spaghetti and meatballs |
What is the organism which causes Pitryasis versicolor? | Malassezia |
Malassezia causes what diseases? | Pitryasis versicolor, Cradle Cap, Dandruff (seborrheic Dermatitis) |
What is the treatment for seborrehic Dermatitis | "Azoles" are primary, also treat with selenium sulfide,salicyclic acid, or pyrithione zinc |
What are the defining features of tinea Nigra? | Brown/black macular lesions on HANDS and FEET. NON-inflammatory |
What is the defining feature of Exophiala Werneckii? | Brown-black yeasts found in soil and shower curtains. |
What is the primary treatment of Exophiala werneckii? | Salicylic acid and benzoic acid (whitfield's ointment) |
What is the defining feature of Piedras?(black and white) | LOCATION; they are located on the external hair shaft. |
What is the organism which causes black piedra? | Piedraia hortae |
What is the organism which causes white piedra? | Trichosporon beigelli |
What is the class of fungal a infections which affect the cutaneous skin? | Tineas |
What is the food source for the cutaneous Tineas? | Keratin |
Where is tinea imbriacata located and what are the defining features? | trunk, legs, forearms have CONCENTRIC rings of scales. |
What is the organism which causes tinea imbricata? | trichophyton CONCENTRICUM (remember concentric rings, concentricum) |
Where is tinea corporis located? | ringworm of trunk and legs |
What organisms cause tinea Corporis? | Trichophyton rubrum, microsporum, canis, trichophyton mentagrophytes. |
What organisms cause Tinea Pedis? | trichophyton rubrum,T. metagrophytes, epidermopyton floccosum |
what is tinea cruris? | rash and scaling of the inner thighs |
Define tinea capitis | disease of children which is ectothrix or endothrix and causes hairloss and scaling. |
what organism causes tinea capitis? | trichophyton tonsurans and schoenleinii and violaceum
Microsporum audouinii |
where is tinea barbae located? | bearded areas of neck and face |
what organism causes tinea barbae? | trichophyton verrucosum |
what is Tinea Unguium? | Fungal infection of the neails that causes thickening and colorization. |
what organisms cause tinea unguium? | trichophyton rubrum and candida |
what treatments would you use for tinea unguium? | "Azoles", terbinafine, griseofulvin, tolnaftate |
What is chromoblastomycosis? | cauliflower like lesions which are typically of the foot. |
What organisms causes chromoblastomycosis? | fonsecea pedrosoi, cladosporium carrionii |
What is sporotrichosis? | rose thorn disease; ulcerative papule that spreads via draining lymph channels |
what causes sporotrichosis? | sporothrix schenckii |
what is the treatment for sporotrichosis? | SSKI, Azole,Amphotericin B |
what is mycetoma? | Infection via thorns and splinters which are small papules and nodules. Lymphatics lead to deep tissue infiltration and bone destruction |
what is the treatment for mycetoma? | surgery or amputation |