eczema. eczema: come from the greek name for boiling, a reference to the tiny vesicles (bubbles)...
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eczemaeczema
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EczemaEczema: Come from the Greek name : Come from the Greek name for boiling, a reference to the tiny for boiling, a reference to the tiny vesicles (bubbles) that are commonly vesicles (bubbles) that are commonly seen in the early acute stage of the seen in the early acute stage of the diseasedisease
DermatitisDermatitis: means inflammation of : means inflammation of skin, it’s a broader term than eczema skin, it’s a broader term than eczema which is only a type of several skin which is only a type of several skin inflammationsinflammations
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Eczema classificationEczema classification Mainly by exogenous irritantMainly by exogenous irritantFactors (contact) allergicFactors (contact) allergic photodermatitisphotodermatitis
Other types atopicOther types atopic seborrhoeicseborrhoeic discoid (nummular)discoid (nummular) pompholyxpompholyx gravitationalgravitational asteatoticasteatotic neurodermatitisneurodermatitis juvenile plantar juvenile plantar
dermatosisdermatosis napkin dermatitisnapkin dermatitis
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pathogenesispathogenesis Similar in all types involving similar Similar in all types involving similar
inflammatory mediators (prostaglandins, inflammatory mediators (prostaglandins, leukotriens, cytokines)leukotriens, cytokines)
Helper T cells sometimes activated by Helper T cells sometimes activated by superantigens from superantigens from StaphStaph. . aureus aureus
Epidermal cytokinesEpidermal cytokines help to produce help to produce spongiosis & that their secretion by spongiosis & that their secretion by keratinocytes elicited by T lymphocytes, keratinocytes elicited by T lymphocytes, irritants, bacterial products, & other irritants, bacterial products, & other stimulistimuli
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histologyhistology Acute stage:Acute stage: spongiosisspongiosis intraepidermal vesicles & blistersintraepidermal vesicles & blisters Chronic stage:Chronic stage: less spongiosis & vesication less spongiosis & vesication acanthosisacanthosis hyperkeratosis & parakeratosishyperkeratosis & parakeratosis
These changes accompanied by various These changes accompanied by various degree of vasodiletation & lymphocyte degree of vasodiletation & lymphocyte infiltration infiltration
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Clinical appearanceClinical appearance
Acute eczema:Acute eczema:
weeping & crustingweeping & crusting
blistering with vesicles blistering with vesicles
redness, papules, swelling redness, papules, swelling
scalingscaling
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Chronic eczemaChronic eczema::
less vesicular & exudationless vesicular & exudation
more scaly, pigmented, thickenedmore scaly, pigmented, thickened
lichenificationlichenification
fissuresfissures
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complicationcomplication Heavy bacterial colonization esp. in Heavy bacterial colonization esp. in
seborrhoeic, atopic, nummularseborrhoeic, atopic, nummular
Local superimposed allergic reaction to Local superimposed allergic reaction to medicaments can provoke disseminationmedicaments can provoke dissemination
Interfere with sleepInterfere with sleep
Interfere with workInterfere with work
Interfere with sporting, activiteisInterfere with sporting, activiteis
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DDXDDX Psoriasis:Psoriasis: sharply marginated, very sharply marginated, very
scaly, involve knee & elbowscaly, involve knee & elbow
Scabies:Scabies: itchy contacts, face spared, itchy contacts, face spared, burrows, affect nipple & genitaliaburrows, affect nipple & genitalia
Lichen planus:Lichen planus: mouth lesion, mouth lesion, violaceous flat topped papulesviolaceous flat topped papules
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Fungal infection:Fungal infection: annular lesions with annular lesions with active edgeactive edge
Palmoplantar pustulosis:Palmoplantar pustulosis: obvious obvious pastules on palm & solepastules on palm & sole
Angiodema & erysipelas:Angiodema & erysipelas: Unusually Unusually swollen, on faceswollen, on face
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investigationsinvestigations
Patch testPatch test
Photopatch testPhotopatch test
Total & specific IgE antibodiesTotal & specific IgE antibodies
RASTRAST
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tratmenttratment acute weeping eczema: acute weeping eczema: rest & liquid applicationrest & liquid application
Nonsteroidal preparationNonsteroidal preparation
Daily 10 min soaks in cool 0.65% Daily 10 min soaks in cool 0.65% aluminium acetate solution aluminium acetate solution
Saline or tap water & soaks followed by a Saline or tap water & soaks followed by a smear of corticosteroid cream or lotionsmear of corticosteroid cream or lotion
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potassium permanganatepotassium permanganate
Calamine lotionCalamine lotion
Magenta paintMagenta paint
Wet wrap dressing: esp. in children a Wet wrap dressing: esp. in children a bath followed by steroid application bath followed by steroid application covered with double layers of tubular covered with double layers of tubular dressingdressing
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Subacute eczema:Subacute eczema:
steroid lotions or creamssteroid lotions or creams
Vioforms, bacitracinVioforms, bacitracin
fucidic acid, mupirocin, neomycinfucidic acid, mupirocin, neomycin
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Chronic eczema:Chronic eczema:
steroid in ointment basesteroid in ointment base
IcthamoleIcthamole
Zinc cream or pasteZinc cream or paste
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nothing stronger than 0.5-1% nothing stronger than 0.5-1% hydrocortisone oint. On face or in hydrocortisone oint. On face or in anfantsanfants
mild potency c.s. not more than mild potency c.s. not more than 200g/wk200g/wk
Moderate potency c.s. not more than Moderate potency c.s. not more than 50g/wk50g/wk
Potent c.s. not more than 30g/wkPotent c.s. not more than 30g/wk
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Systemic therapySystemic therapy systemic steroid (prednisolone)systemic steroid (prednisolone)
HydroxyzineHydroxyzine
DoxepinDoxepin
TrimeprazineTrimeprazine
Systemic antibioticsSystemic antibiotics
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Common patterns of Common patterns of eczemaeczema
Irritant contact dermatitisIrritant contact dermatitis 80% of dermatitis cases80% of dermatitis cases
Mostly industrialMostly industrial
Usually on hands & forearmUsually on hands & forearm
Acute reaction elicited after brief contactAcute reaction elicited after brief contact
Commonly by detergents, alkalis, Commonly by detergents, alkalis, solventssolvents
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May lead to loss of workMay lead to loss of work
DDX: allergic contact dermatitis, DDX: allergic contact dermatitis, atopyatopy
Patch test with irritants is not helpful Patch test with irritants is not helpful & may be misleading& may be misleading
Rx: avoid irritants, use protective Rx: avoid irritants, use protective measures, barrier creams, topical measures, barrier creams, topical steroids & emollients, change of jobsteroids & emollients, change of job
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Allergic contact dermatitisAllergic contact dermatitis The mechanism is delayed type 4 The mechanism is delayed type 4
hypersensetivity hypersensetivity
Previous contact is neededPrevious contact is needed
Its specific to one chemical usuallyIts specific to one chemical usually
Remote areas may be affectedRemote areas may be affected
Sensetization is persists indefinitelySensetization is persists indefinitely
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Most allergens are simple chemicals that Most allergens are simple chemicals that bind to a protein to become complete bind to a protein to become complete antigenantigen
Areas involved eyelids, external auditory Areas involved eyelids, external auditory meatus, hands & feetmeatus, hands & feet
High risk individuals are hair dressing, High risk individuals are hair dressing, working in flower shop, dentistyworking in flower shop, dentisty
Common allergens: chrome, nickle, cobalt, Common allergens: chrome, nickle, cobalt, lanolin, neomycin, rubber, poison ivy & lanolin, neomycin, rubber, poison ivy & oak oak
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Jewellery, bra clips, jeans stud are Jewellery, bra clips, jeans stud are common causescommon causes
Patch test is recommendedPatch test is recommended
Rx: avoid allergens, topical steroid, Rx: avoid allergens, topical steroid, adding ferrous sulphate to cement to adding ferrous sulphate to cement to reduce its water soluble chromate reduce its water soluble chromate contentcontent
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atopyatopy Means without place in greekMeans without place in greek
Is a state in which exuberant production of Is a state in which exuberant production of IgE occurs as a response to common IgE occurs as a response to common environmental allergensenvironmental allergens
Atopic patient develop one or more of Atopic patient develop one or more of atopic diseases as asthma, aczema, hay atopic diseases as asthma, aczema, hay fever, & food allergiesfever, & food allergies
Concordance rate in monozygotic twins is Concordance rate in monozygotic twins is 86%, in dizygotic is 21%86%, in dizygotic is 21%
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75% begin before 6 months, 80-90% 75% begin before 6 months, 80-90% before 5 years, totally affect 3% of before 5 years, totally affect 3% of infantsinfants
60-70% will clear by their early teens60-70% will clear by their early teens
It has 3 phaces:It has 3 phaces:
1.1. Infantile: vesicular, weeping, start at faceInfantile: vesicular, weeping, start at face
2.2. Childhood: leathery, dry, excoriated, Childhood: leathery, dry, excoriated, affects elbow, knee flexures, wrist ankleaffects elbow, knee flexures, wrist ankle
3.3. Adults: lichenification, more wide spread, Adults: lichenification, more wide spread, white dermographism is strikingwhite dermographism is striking
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Cardinal feature is itchingCardinal feature is itching Diagnostic criteria:Diagnostic criteria:
Must haveMust have::
chronically itchy skinchronically itchy skin
plus 3 or more of the followingplus 3 or more of the following::
history of itching in skin creaseshistory of itching in skin creases
history of asthma or hay feverhistory of asthma or hay fever
general dry skingeneral dry skin
visible flexural eczemavisible flexural eczema
onset in first 2 years of lifeonset in first 2 years of life
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Complications: bacterial infections, Complications: bacterial infections, widespread Herpes simplex, M. widespread Herpes simplex, M. contagiosumcontagiosum
Prick test used to show type 1 reactionPrick test used to show type 1 reaction
Rx: explanation, reassurance, aviod Rx: explanation, reassurance, aviod exacerbating factors, topical steroids, exacerbating factors, topical steroids, tacrolimus, sedative antihistamines, tacrolimus, sedative antihistamines, antibiotics, UVA, UVB, cyclosporinantibiotics, UVA, UVB, cyclosporin
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Seborroeic dermatitisSeborroeic dermatitis common eczema of the hairy areas show common eczema of the hairy areas show
characteristic greasy yellowish scalescharacteristic greasy yellowish scales
Red scaly exudative or dry scaly or Red scaly exudative or dry scaly or intertriginousintertriginous
Affects scalp, ears, eyebrows, face, Affects scalp, ears, eyebrows, face, presternal area, armpits, umblicus, groinpresternal area, armpits, umblicus, groin
May be familial, affect those with dandruffMay be familial, affect those with dandruff
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there may be overgrowth of of there may be overgrowth of of pityrosporum yeasts pityrosporum yeasts
May be early sign of AIDSMay be early sign of AIDS
Mainly affect adults, usually recurrentMainly affect adults, usually recurrent
May associated with furunculosis, or May associated with furunculosis, or superadded candida infectionsuperadded candida infection
Rx: topical imidazole, sulphur, salicylic Rx: topical imidazole, sulphur, salicylic acid, topical steroids, ketoconazole acid, topical steroids, ketoconazole shampooshampoo
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Discoid (nummular ) eczemaDiscoid (nummular ) eczema Common endogenous eczemaCommon endogenous eczema
Affects limbs of middle age malesAffects limbs of middle age males
Reaction to bacterial antigen is Reaction to bacterial antigen is suspectedsuspected
Multiple coin shaped vesicular Multiple coin shaped vesicular crusted itchy plaquescrusted itchy plaques
Rx: topical steroid & antibioticsRx: topical steroid & antibiotics
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pompholyxpompholyx Recurrent bouts of vesicles or blisters on Recurrent bouts of vesicles or blisters on
palms, fingers & or sole of adultspalms, fingers & or sole of adults
Cause is unknown,may provoke by stress Cause is unknown,may provoke by stress or heat or may be allergy to nickleor heat or may be allergy to nickle
Recurrent infection & lymphangitis is a Recurrent infection & lymphangitis is a recurrent problem, it may follow acute recurrent problem, it may follow acute Tinea pedisTinea pedis
Rx: antibiotics, aluminium acetate, Rx: antibiotics, aluminium acetate, potassium permanganate, steroidspotassium permanganate, steroids
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Gravitational (stasis) eczemaGravitational (stasis) eczema Usually accompanied by venous Usually accompanied by venous
insufficiency, haemosidrin depositioninsufficiency, haemosidrin deposition
Chronic patches of eczema on lower legsChronic patches of eczema on lower legs
Patient may become sensetized to local Patient may become sensetized to local antibiotics or to preservatives in antibiotics or to preservatives in medicated bandagesmedicated bandages
Rx: eliminate oedema, topical steroids, Rx: eliminate oedema, topical steroids, zinc creamzinc cream
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Asteatotic eczemaAsteatotic eczema Itchy eczema patches on lower legs Itchy eczema patches on lower legs
of eldrlyof eldrly
Contributory factors: Dry skin in old, Contributory factors: Dry skin in old, low humidity in winter, cental low humidity in winter, cental heating, diuretics, hypothyroidismheating, diuretics, hypothyroidism
Rx: steroids, restrict bathing, daily Rx: steroids, restrict bathing, daily use of emollientsuse of emollients
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Localized neurodermatitis Localized neurodermatitis (lichen simplex)(lichen simplex)
Single fixed itchy lichenified plaque Single fixed itchy lichenified plaque on nape of neck in women, legs in on nape of neck in women, legs in men & anogenital area in both sexesmen & anogenital area in both sexes
Skin damaged from repeated rubbing Skin damaged from repeated rubbing or scratching as a habit in response or scratching as a habit in response to stressto stress
Rx: topical steroid with occlusion, Rx: topical steroid with occlusion, tranquilizers are with little effecttranquilizers are with little effect
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Juvenile plantar dermatosisJuvenile plantar dermatosis May be related to modern socks & shoe May be related to modern socks & shoe
lining withsubsequent sweat gland lining withsubsequent sweat gland blockageblockage
Called toxic sock syndromeCalled toxic sock syndrome
Forefeet & undersides of toes become dry Forefeet & undersides of toes become dry shiny with deep painful fissures shiny with deep painful fissures
Rx: use of cork insole in shoes, cotton or Rx: use of cork insole in shoes, cotton or wool socks, emmolients, icthammol, wool socks, emmolients, icthammol, steroidsteroid
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Napkin (diaper) dermatitisNapkin (diaper) dermatitis Irritant in nature aggravated by Irritant in nature aggravated by
waterproof plastic pants, feces, urinewaterproof plastic pants, feces, urine
Moist glazed sore erythema of napkin Moist glazed sore erythema of napkin area sparing skin folds (which diff. it area sparing skin folds (which diff. it from seborrhoeic eczema)from seborrhoeic eczema)
Candida superinfection is common Candida superinfection is common appears as erythematous appears as erythematous vesicopustules on peripheryvesicopustules on periphery
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Rx: keep this area clean & dry, use Rx: keep this area clean & dry, use disposal diapers, topical zinc, caster disposal diapers, topical zinc, caster oil, silicone, mild steroid-antifungal oil, silicone, mild steroid-antifungal combination combination
The child should be allowed to be The child should be allowed to be free of napkins as much as possiblefree of napkins as much as possible