fungus-2.ppt
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Selling a Product or Service
FUNGAL
SKIN
INFECTIONS
II
IHAB YOUNIS, M.D.
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B. Cutaneous mycoses
Infections that extend deeper intothe epidermis, as well as hair andnail and caused by dermatophytes
!"inea capitis!"inea corporis
!"inea manus
!"inea cruris!"inea pedis
!"inea unguium
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Tinea capitis
#tymology $. %caput& head
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"inea capitis is the most commonpediatric dermatophyte infectionworldwide
"he age predilection is believed toresult from the presence ofMalassezia furfurwhich is part ofnormal 'ora, and from the fungistatic
properties of fatty acids of short andmedium chains in postpubertal sebum
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Hair invasion bydermatophytes
#ctothrix invasion (rthroconidia on theexterior of the hair shaft. "he cuticle ofthe hair is destroyed and infected hairs'uoresce under a )ood*s lamp
#ndothrix hair invasion (rthroconidiawithin the hair shaft only. "he cuticle ofthe hair remains intact and infected
hairs do not 'uoresce under a )ood*slamp
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Ectothrix
Endothrix
Hair
Conidia
Hair
Conidia
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Types
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1-Scaly type:
#rythematous
papule+s around the hair shaft appear initially
Subse-uently, one or
several patches of scaly alopecia are seen where
the hairs are broen /ust
above the level of scalp
"he hair loos lusterless
as it is covered with
arthrospores
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2-Black dots type:
It is an endothrix infection,
so hairs become notably
fragile and brea easily at
the level of the scalp "he rest of the infected
follicle loos lie
0blac dots0. 1ariabledegrees of scaling and
in'amm2ation are seen
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3-Kerion :
Scattered painful pruritic pustularfolliculitis generally associated withregional lymphadenopathy and evenfever
In about 324 5, boggynodules studded with
broen hairs and purulent
sticy material 0erion0
appear
Scarring alopecia develops
subse-uently
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-!avus :"tymolo#y:$. honeycomb
6ense masses of mycelium
and epithelial debris forming yellowish cup2shaped crusts
called scutula
"he scutulum develops
at the surface of a hair
follicle with the shaft in
the center of the raised
lesion
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7emoval of these crusts reveals anoo8ing,moist, red base
(fter a period of years, atrophy ofthe sin occurs leaving a cicatricial
alopecia and scarring
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Tinea corporis $circinata%
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"tiolo#y
(9ects the glabrous sin +ie, sinregions except the scalp, groin, palms,and soles
T rubrumis the most commoninfectious agent in the world
:ay result from contact with infectedhumans, animals, or inanimate ob/ects+eg contact with sports facilities
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ClinicallyPatients can be asymptomatic or
pruriticBegins as an erythematous, scaly
pla-ue that may rapidly worsen
and enlarge;entral
resolution
causes the
lesion to
be annular
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Scales, crusts, vesicles, and papulesoften develop, especially in theadvancing border
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Infections due to 8oophilic or
geophilic dermatophytes mayproduce a more intense
in'ammatory
response thanthose caused
by anthropophilic
fungi
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:a/occhi granuloma manifests asperifollicular, granulomatous
nodules typically in a
distinct location, which is
the lower two thirds of the
leg in females
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"inea imbricata +Imbricate
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