Tx of Common Skin Disorders, Varicella, and Zoster IZs Flashcards

1
Q

Acne Vulgaris Pathogenic Factors

A
  • excess sebum production
  • keratinization→excess sloughin leads to blocked flow of sebum →black head (open comedo)
  • bacterial gorwth
  • inflammation
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2
Q

Development of Acne

A
  • bacteria proliferation (propionibacterium acnes [normal skin anaerobe]) + Sebum + keratinzation → inflammation → white head (closed comedo)
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3
Q

Keratolytic Agents

A
  • tx acne: apply BID
  • 1st line:
    • Benzoyl Perodixe: promotes shedding of epidermis for mild, non-inflammatory acne
      • SE: drying and peeling, hypersensitivty esp in asthmatics
  • 2nd line:
    • sulfure: less effective
      • has an odor
      • can cause brown scaling = Resorcinol
      • can cause salicylate intoxication with chronic use
    • Salicyclic Acid: readily abosrbed
      • 3% & 6% reak down horny layer of skin
      • 40% can be used to remove warts, calluses, and corns
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4
Q

Retinoids

A
  • treatment of acne, examples: Tretinoin, (adapalene (more expesnive b/c less side effects), tazarotene) [same side effects but not as sever as Tretinoin]
  • 1st line: for mild to moderate comedonal and inflammatory acne
    • stimulate the turnover of epithelial cells
    • unclog blocked pores
    • have anti-inflammatory properties
      • inhibit monocyte chemotaxis and neutrophils
    • Can be used with topical abx and benzoyl peroxide
  • SE: transient erythema, irritation, dryness, pealing photosensitivity
  • AVOID: children under 12 years old and pregnancy
  • Pt Education: symptoms may worsen in first few weeks, but should see improvement in 3-4 months
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5
Q

Topical Antibacterials for Acne

A
  • directly suppress P. acnes (anaerobic normal flora)
  • 1st line for mild to moderate inflammatory acne
    • examples:
      • Clindamycin 1%
      • erythromycin 2% QD-BID
    • SE: dryness, erythema, itching
  • can be added with benzoyl peroxide to decrease resistance and improve symptoms
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6
Q

Azelaic Acid

A
  • Mechanism of Action:
    • anti-bacterial
    • anti-inflammatory
    • stabilize keratinization
  • Indications:
    • for pts who cannot toleralte benzoyl or topical retinoids
    • mild to moderate acne
  • Side Effects:
    • erythema
    • skin irritation: should avoid occlusive dressings
    • may cause hypopigmentation
  • 20% cream apply BID, should see improvement in 1-2 months
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7
Q

Dapsone Gel

A
  • Mechanism of Action: (type of abx)
    • anti-microbial
    • anti-inflammatory
    • for mild-moderate acne
  • SE:
    • dryness, erythema, oiliness, peeling
  • Apply BID, if no improvement after 12 weeks (3 months) , re-evaluate treatment
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8
Q

Acne Treatment: Oral Abx

A
  • treatment for moderate to severe acne (especially after failed topicals)
  • prevent acne lesions from developing
  • using takes about 6-10 weeks to see improvement, maximal effects at 6 months
  • 1st line:
    • doxycyline, TCN, minocycline (Don’t Touch Me)
  • 2nd line:
    • erythromycin (inhibits 3A4), clindamycin,
    • isotretinoin (not an abx)
    • (Every Child’s Ill)
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9
Q

Oral Acne Treatment: Isotretinoin

A
  • only indicated for severe acne that is unresponsive to other POs and topicals
  • can cause remission of acne for several years
  • **requires online registery program iPledge**
    • category X drug
    • 2 negative pregnancy tests prior to start
      • 1 negative test each month during treatment
  • SE:
    • dry skin and mucus membranes
    • muscle and joint pain
    • elevated liver enzymes and triglycerides
    • depression
    • teratogenicity (inhibits fetal development)
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10
Q

teratogen

A

inhibits fetal development

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11
Q

Oral Acne Treatment: Oral concraceptives

A
  • 2nd line treatment for moderate to severe acne in females
  • yaz, estrostep, ortho tri-cyclen
  • oral contraceptives reduce the production of androgens in the ovaries →decreased production of sebum
  • SE:
    • nausea/vomiting
    • weight gain
    • breast tenderness
    • breakthrough bleeding
    • Venous thromboembolism (especially in heavy smokers)
      • caused by the estrogen in the pill
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12
Q

Contact Dermatitis: irritant vs allergic

A
  • irritant:
    • will have rxn with 1st time exposure
    • casuses damage to epidermis → erythema
    • examples:
      • soaps, detergents, cosmetics, solvents, acid, mild or strong
      • alkali, mild or strong
  • Allergic:
    • need to have an initial sensitivity
    • triggered by an immune response
    • examples:
      • plant resins, poison ivy, poison oaky, sumac
      • metals (nickel or gold in jewelry)
      • latex and rubber
      • cigarette smoke
      • local anesthetics (lidocain or benzocaine)
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13
Q

Atopic Dermatitis

A
  • aka eczema
    • signs:
      • crusting and oozing
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14
Q

Non-Pharmacologic Treatment of Contact Dermatitis

A
  • relieve pruritis
  • maintain the hydration of the skin
  • colloidal oatmeal baths
  • cool soapless showers
  • cool moist compressed TID
  • emollients: mineral oil or petrolatum
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15
Q

Pharmacological Treatment of Contact Dermatitis

A
  • astringents
  • topical steroids
  • PO steroids: widespread areas and sxs
  • antihistamines
  • topical immunosuppressants
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16
Q

Astringents

A
  • treatment for contact dermatitis
  • have drying effects → decreases oozing and relieves itching
  • causes vasoconstriction → anti-inflammatory
  • examples:
    • aluminum acetate
    • calamine lotion; zinc oxide
    • witch hazel
    • 15-30 min BID-QID
    • no longer than 7 days
  • SE:
    • drying, tightening of skin
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17
Q

Topical Steroids

A
  • relieve redness, inflammation, itching and pain
  • Vehicles:
    • ointment
    • creams
    • lotions
    • gels
    • foams/mousses/ shampoo
  • Want to provide optimal dosing: titrating amount to minimum that still gives relief
  • chronic application can lead to tolerance and tachyphylaxis
    • ultra-high potency: no longer than 3 weeks continuously
      • need to gradually taper to prevent rebound
    • 3 weeks on 1 week off dosing schedule
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18
Q

Oral Antihistamines for Pruritus

A
  • diphenhydramine
  • hydroxizine
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19
Q

Topical Immunosuppressants

A
  • pimecrolimus (Elidel) cream:
    • apply BID on anyone over 2 years
    • no longer than 6 weeks
    • avoid occlusive dressing
  • Tacrolimus ointment:
    • apply BID
    • can cause burning, erythema, pruritus
    • 3rd line
  • ​For SEVERE activation of immune symptoms
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20
Q

Tinea Infections

A
  • fungal infections where the fungus lives in keratinous layers of the nail or skins
  • types of lesions: rings, scales, single or multiple areas
    • circular ring lesions: ringworm
  • examples:
    • tinea pedis
    • tinea manuum
    • tinea cruris
    • tinea corporis
    • tinea versicolor
    • tinea barbae
    • tinea capitis
    • onychomycosis (tinea unguium)
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21
Q

tinea pedis

A
  • involves plantar surface and interdigital spaces of foot
22
Q

tinea manuum

A
  • infection of the interdigital and palmar surfaces
23
Q

tinea cruris

A
  • presents with follicular papules and pustules on the mdeial thigh and inguinal fold
  • ringed lesions may extend from the inguinal fold over to the adjacent inner thigh
24
Q

tinea corporis

A
  • presents with circular scaly patch with enlarged border
25
tinea versicolor
* characterized by skin depigmentation but can present as hyperpigmentation * especially dark-skinnned patients
26
tinea barbae
* infection of beard area
27
tinea capitis
* infection of the head and scalp
28
Onychomycosis
* aka tinea unguium * infection of nail plate and bed
29
Steroid Ointments
* more lubrication * occlusion which improves absorption * **helpful for thick, dry hyperkeratotic lesions** * **not good for hairy areas** * may cause maceration and folliculitis (in "skin rubbing areas" like the groin and the armpits) * they can be greasy which can cause an unpleasant sensation which may decrease compliance
30
Steroid Creams
* mix of water suspended in oil * good lubrication but **less potant than same medications in ointments** * often contain preservatives which may lead to allergic reactions, stinging, irritation * used for exudative inflammation (i.e. poison oak)→ has drying effects * does NOT provide occlusive effects
31
Steroid Lotions
* these are the LEAST greasy and occlusive * good for **hairy areas** * contains alcohol which has a drying effect → excellent for oozing lesions
32
Steroid Gels
* for **exudative inflammation** (i.e. poison oak) * dries quickly * good for use on **hairy areas or scalp**
33
Steroid Foams/Mousse/Shampoo
* spreads easily in hairy areas * good penetration
34
Diaper Dermatitis Treatment
* Protectants: * occlusive barrier * cream/ointment * promote healing * zinc oxide, petrolatum, witamins, A&D Lanolin, topical cornstarch * Topical Steroids * Anti-fungals * diaper rashes that last \>48-72 hours at high risk of fungal infection * nystatin crea * clotrimazole * miconazole * BID-QID * Anti-bacterial
35
Lanosterol
* stabilizes fungal membranes * precursor to Ergosterol
36
Recurrent Vuvlovaginal Candidiasis
* Fluconazole 150 mg PO Q3days x 2 * Topical azoles x 14 days * consider non-albicans infections (C. Glabrata and C.tropicalis) * Resistant to fluconazole and itraconazole * tx: * 1st line: **terconazole** * 2nd line: vaginal borric acid capsules 2 weeks BID * **Difficult** to treat: * high levels of estrogen * don't want to harm the fetus.
37
Vulvocandidiasis during pregnancy
* this is difficult to treat during pregnancy due to: * high levels of estrogen * potential harm to the fetus * fluconazole can cause congenital limb deformities if 400-800mg Q day are used during 1st trimester * Vaginal antifungals that can be used: * **clotrimazole** * 1-2 weeks is the preferred treatment
38
Impetigo--superficial infection tx
* scabby, crusty eruption usually caused by poor hygiene and crowding * **\*\*common bugs\*\*:** * beta-hemolytic streptococci * **group A strep** * **​Staph aureus** * tx: * mild: **Mupirocin (Bactroban) topical ointment** * **penicillinase-stable penicillins** * **1st gen cephalosporins** * Alternative: * clindamycin * macrolide
39
Treatment of Scabies
* Sarcoptes scabiei * **Permethrin (Elimite)** 5% cream * apply to whole body from neck down for 8-14 hours * Alternatives: * **Crotamiton (Eurax)** 10% cream or lotion * Q24hours x 2 * **Ivermectin (Stromectol)**
40
Shingrix: Ingredients, Indications, Administration
* Ingredients: * lyophilized **varicella zoster virus glycoprotein E (gE) antigen** * Indications: * **immunocompetent \>50 years old** * not indicated for prevention of primary varicella infection * Administration: * **IM 2 doses (0.5mL each) at 0 and 2-6 months later** * Contraindications: * severe allergic reaction * just received a dose * or just delay vaccine if: * pregnant or breastfeeding * *currently* have a shingles episode
41
pneumonic to remember topical acne therapies
* KRAAD: * Keratolytics * benzoyl peroxide 1st line * ASA 2nd line * Sulfur 2nd line * Retinoids * Antibacterials * Azelaic Acid * Dapsone gel →mostly severe cases
42
Retinoid Examples and what they can be used with
* Tretinoin (once daily before bed) * Adapalene * more expensive because less side effects * Tazarotene * last line agent * same SEs but **MORE** severe * Can be used with topical abx (clindamycine and erythromycin) and benzoyl peroxide
43
Low Potency Steroids
* **Hey Fluorence, Design This Mask/Mouth** * Hydrocortisone 1-2.5% * Fluocinolone 0.01% * Desonide 0.05% * Triamcinolone **(0.1%-0.025%)** * Mometasone 0.1%
44
High Potency Steroids
* **Best DonuTs And CHips** * Betamethasone * Desoximetasone * Triamcinolone (**0.5% → medium to high**) * Augmented Betamethasone * Clobetasole * Halobestasol
45
Ultra-High Potency Topical Steroid Considerations
* titrate to minimum frequency * no longer than 3 weeks * 3 weeks on 1 week off * otherwise results in **tachyphylaxis** (tolerance) * SEs: * steroid atrophy * secondary infections * delayed wound healing * hypopigmentation * rebound flare * cataracts (if too much in blood stream)
46
Oral Antihistamines used for Pruritus
* diphenhydramine * hydoxyzine (Atarax/ Visteril) → also used for anxiety
47
Imidazoles
* type of Azole (slightly different structure than triazoles) * **I Make The Canadian Eat Ketoh** * Imidazoles * Miconazoles * Tioconazoles * Clotrimazole * Econazole * Ketoconazole
48
Triazoles
* type of azole (interferes with ergosterol synthesis because blocks fungal P450 enzymes) * **Try Flying Past That Insane Vortex** * Triazoles * Fluconazole * Posaconazole * Terconazole * Itraconazole * Voriconazole
49
Echinocandins
* antifungal drug that blocks the cell wall synthesis * inhibit beta-glucan synthesis * **Caspofungin -- IV**
50
Allyamine
* antifungal drug that inhibits the epoxidation of Squalene which leads to high squalene levels and results in cell death * **Terbinafine** * **Butenafine**
51
Systemic Therapy for Tinea Infections
* Fluconazole