Transcript Acne Vulgarispresentation

Acne vulgaris: overview
Introduction:
Definition:
Multi-factorial disease characterized by
abnormalities in sebum
production, follicular desquamation, bacterial
proliferation and
inflammation.
Prevalence:
 85% adolescents experience it
 Prevalence of comedones (lesions) in
adolescents approaches 100%
Overview
 Acne vulgaris is the most common cutaneous disorder in
the U.S.
 It affects more than 17 million Americans.
 10 percent of all patient encounters with primary care
physicians.
 Pts can experience significant psychological morbidity
and, rarely, mortality due to suicide.
 Important that physicians are familiar with Acne Vulgaris
and its treatment.
Acne Vulgaris
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Asked questions concerning acne.
How does acne develops ?
Factors for development of acne
What are the predisposing factors
Is it familiar? Is it controllable.
Is it associated with diet or dust?
Does cosmetic cause acne.
Does drugs cause acne.
Does stress has any role in causation of the
acne ?
Pathogenesis:
Acne vulgaris is a disease of
pilosebaceous follicles.
Factors:
• Retention hyperkeratosis.
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Increased sebum production.
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Propionibacterium acnes
within the follicle.
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Inflammation
Etiology, signs and symptoms
• Acne vulgaris commences in the pilosebaceous
units in the dermis. These units consist of hair
follicle and the associated sebaceous glands.
They are connected to the skin by a
duct(infundibulum) through which the hair shaft
passes.
• Non inflamatory acne; ( acne that characterized
by closed and open comedones )
• The cause of acne is an increase in the activity
of the sebaceous glands and the epithelial tissue
lining the infundibulum.
Etiology, signs and symptoms
• The glands produce more sebum causing
increased oiliness of the skin.
• The epithelial cells become more distinct
,durable and stick together to form a coherent
horny layer which blocks the follicular channel.
This impaction plugs distends the follicle to form
a microcomedo
• NB, normally epidermal cells continually
sloughs off and moves to the surface of the
skin with the sebum.
continue
• As more cells and sebum are added, the
comedo becomes visible (whitehead) and is
called a closed comedo, is., its content do not
reach the surface of the skin. If plug enlarges
and protrudes from the orifice of the follicular
canal, it is called an Open comedo, its contents
open to the surface of the skin. The tip may
darken (blackhead) because of the accumulation
of melanin that is produced by the epithelial cells
of the follicular lining.
Initial pathogenesis (reason unknown):
follicular hyperkeratinization
proliferation +
decreased desquamation of keratinocytes
hyperkeratotic plug
(microcomedone)
Pathogenesis
Sebaceous glands enlarge
Sebum production increases
Growth medium for P. Acnes
plugs provide anaerobic
Lipid-rich environment
Pathogenesis
Bacteria thrive
Inflammation results
Chemotactic factors attract neutrophils
Depending on conditions
Non-inflammatory
open/closed comedones
Inflammatory papule/
pustule/nodule
Terms/Definitions
• Microcomedone:
• hyperkeratotic plug made of sebum and keratin in
follicular canal
Closed comedones (whiteheads)
• closed comedo
(a whitehead):
Accumulation of sebum
converts a
microcomedo into this.
Closed comedones (whiteheads)
Open comedo (blackhead)
• open comedo
(a blackhead):
when follicular orifice is
opened + distended.
Melanin + packed
keratinocytes + oxidized
lipids  dark colour
Open comedo (blackhead)
Whitehead and blackheads
Inflammatory acne
• Acne characterized by inflammation surrounding the
comedones, papules, pustules, and nodulocystic lesions. it
may cause permanent scarring.
• Inflammatory acne begins in closed comedones, rarely in
open ones. As the micro comedo develops, it .distends the
follicle, which cause thinning of the walls. primary
inflammation of the follicle wall develops with the disruption
of the epithelium and infiltration of lymphocytes in to the
adjacent area of the dermis.
• Normal sebum does not contain free fatty acids and is
nonirritating, however, in the presence of biolytic enzymes
produced by C.acne) , triglycerides of the sebum are split
and release fatty acids which are irritating to the tissue.
Thus sebum contribute to inflammation of the surrounding
tissue.
• The inflamed follicle or pustules either heal in about a week
or develop in to cyst or sterile abscesses, which can lead to
scaring.
Cysts
• Cysts:
when follicles rupture into
surrounding tissues,
resulting in
papule/pustule/nodule.
Cysts
Aggravating factors
• Change in sebaceous activity and hormonal
level (e.g. before or during premenstrual cycle)
• High humidity conditions
• Local irritation or friction
• Rough or occlusive clothing
• Cosmetics( having greasy base)
• Diet; chocolate, nuts, fats colas, or
carbohydrates.
• Oils greases , or dyes in hair product.
Strategy for treatment of acne
Treatment must be long term however symptoms can
be reduced and permanent scaring can be
minimized.) it involves:
* Removal of excess sebum by washing the affected areas
three times a day with warm water and soap.
*Topically applied oils and fats e.g. in cosmetics should be
eliminated.
* Prevention of pilosebaceous orifice closure by use of mild
irritants. the irritant effect causes an increased rate of
turnover of the epithelial cells lining the follicular duct.
Peeling agents also cause keratolysis, which reduces
the cohesiveness of the follicular lining.
Medications that can cause acne
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ACTH
Azathioprine
Barbiturates
Isoniazid
Lithium
phenytoin
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Disulfiram
Halogens
Iodides
Steroids
Cyclosporine
Vitamins B2,6,12
Treatment of Acne Vulgaris
• depends on type of clinical lesions
• Choose vehicle for topical drug according to pt’s skin
type. (gel for oily, cream for dry skin).
• Microcomedone matures in 8 weeks
• Therapy must continue beyond this time frame
• considerable heterogeneity in the acne literature, and no
clear evidence-based guidelines are available
Ingredients in OTC products
• Sulfur; precipitated or colloidal, 2-10 % other
forms, such as zinc sulfide or sodium thiosulfate,
are milder. Sulfur presents a paradox in that it
helps resolve formed comedones but may
promote the formation of new ones. Due to this
comedogenic effect, the use of salicylic acid or
resorcinol is preferred.
• Resorcinol and salicylic acid;
continue
• Combination of resorcinol and salicylic acid in ethanol solution
is advantageous because it dries quickly and does not leave a
visible film.
• Benzoyl peroxide;(5to 10% cream)a primary irritant which
increases the growth rate of epithelial cells, causing an
increased rate of sloughing and promoting resolution of
comedones,
• Salicylic acid is used in concentration of o.5 to 2%.
• Applied at night after washing the affected area with soap and
water.
• Resorcinol(1to 4%) may produce a dark brown scale on some
black- skinned people; reaction is reversible when the condition
is discontinued.
• NB, the drug may produces a feeling of warmth, slight stinging ,
and reddening of the skin . If this action is excessive the
preparation should be removed with soap and water and not
reapplied until the next day. It should not be used on the eye
lids, lips, or neck.
Tretinoin Transe retinoic acid
• The acid form of vitamin A, is a strong primary irritant ,
similar to benzoyl peroxide, but is more effective. It is
available as solution in aqueous gel base (0.05%). Or as
cream (0.1%). The products are applied at night. They
cause a feeling of warmth or slight stinging . Optimum
results occur in3 to 4 months.
• NB . Care should be taken to avoid touching with eyes,
nose, and mouth with tretinoin.
• Should not used with other keratolytic
• Should not be applied to wet skin as it cause excessive
irritation
• Exposure to strong sunlight should be avoided because
of the increased sensitivity of the skin,.
• Does not cause the toxic effects of a large doses of
vitamin a
• Tetracycline and some other antibiotics
orally administered reduce bacterial
population and the concentration of the
fatty acids in the sebaceous follicle.
Topical antibacterial agents generally are
ineffective, because acne is not an
infection. These agents can not reach the
anaerobic C. Acnes which are found in the
deeper areas of the follicle.
Oral tetracycline
• Acne is not an infection, so topically antibacteril agent
are ineffective, these agents cannot reach in the deeper
areas of the follicles( to the anaerobic coryn bacterium
acne)
• ERYTHROMYCIN:
• 2% solution in 2:2:1 mix of ethanol- ethylene glycol
monomethyl ether + propylene glycol.
• NB, erythromycin reduce level of fatty acid of the follicles
to the level reached by the oral tetracyclin Why ?
• It is lipid soluble antibiotics which can penetrate the
sebaceous follicle to suppress c. bacterium acne
• Both oral tetracyclin and local erythromycin are
prescription drugs only.
Effect of sunlight
• Is often beneficial in acne conditions, due to the
irritant properties of the UV rays.
Secondary formulation factors.
. Lotion and creams, are generally used as the
vehicles to carry anti acne medication to the
skin. They should have a low fat content so that
they do not counteract drying and peeling.
.ethyl or isopropyl alcohol added to the liquid
preparations and gels hastens their drying to a
film.
Comedonal acne
• Other topical agents:
• Useful when topical retinoids not tolerated
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Salicylic acid (promotes desquamation)
Azelaic acid (antimicrobial, reduces hyperpigminetation)
Gycolic acid
Sulfur in OTC rx (keratolytic)
Mild to moderate inflammatory acne
• Benzoyl peroxide: (antimicrobial, anticomedonal,
pregnancy risk C)
• Topical antibiotic
• Combination of both
• Combination rx more effective than mono in increased
inflammatory lesions.
Mild to moderate inflammatory acne
• Topical antibiotics
• Eliminate P. Acne
• Reduce inflammation
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Clindamycin
Erythromycin
Tetracycline
Metronidazole
Azelaic acid
Moderate to severe acne:
• If topical Rx not effective  oral isotretinoin
 oral antibiotics
 hormonal rx
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Oral isotretinoin
Reduces sebaceous gland size/sebum production
regulates cell proliferation and differentiation
Effect last 1 yr after cessation
Only med altering course of A. Vulgaris
Moderate to severe acne:
oral isotretinoin
• Adverse effects can be severe:
• Inc TG, teratogenic, bone marrow suppression,
hepatotoxicity, top 10 drugs for suicide/depression
reports.
• FDA practice rules:
2 negative pregnancy tests before rx
Pregnancy test each month (bring pt in)
physicians need authorization before prescribing
Pregnancy risk pts must use 2 contraceptive for at least
1 mo prior to rx. (manufacturer—must commit to 2 contracept.)
Moderate to severe acne:
• Oral antibiotics
-Tetracycline
- minocycline
- doxycycline
- erythromycin
- TMP-SMX
- clindamycin
• Given daily over 4-6 mo, with taper.
Patient FAQs
• Soaps, detergents
remove sebum but do
not alter production
• Avoid occlusive
clothing
• Water based cosmetic
better than oil based
• Diet modification no
role in rx