THE PROCESS OF PIMPLE
FORMATION:
The
pimples on the face, neck and back etc are all produced as a result of
the following sequence: Obstruction of the follicle (whitehead,
blackheads) causes distension, then infection of the retained sebum
causes inflammation and pus formation.
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Obstruction:
flakes from the horny layer (excess keratinisation) of the follicle
itself get mixed with sebum and this mixture dries out and creates a
plug that obstructs the drainage of sebum. This small bump in the
skin we know as a whitehead. As the sebum becomes old and drier it
becomes browner and these show up as blackheads.
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Distension:
The sebaceous glands continue to produce sebum and the distension of
the gland and follicle becomes more obvious and may eventually form
large cysts that are not infected.
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Infection:
Bacteria found on the surface of the skin may contaminate the cyst
and then grow in the sebum and break down the sebum into fatty acids
amongst other things. The fatty acids can penetrate into the
surrounding dermis and this causes inflammation. (Redhead).
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Pus
formation: Inflammation progresses on to pus formation which
ends up as a "yellow-head". The pus filled glands may
rupture and cause surrounding scarring (fibrosis). The scars may be
shallow or deep.
Aggravating
Factors
The
exact underlying cause is not clear at this stage. Androgens act on the
sebaceous glandular cells (sebocytes) and stimulate the production of
sebum. It seems that there is an alteration in the nature of the sebum
secreted so that it may more easily thicken
and harden to form a plug that obstructs the sebaceous gland.
Some
people seem to inherit more sebaceous glands on their face and other
areas. People with acne may inherit sebaceous glands that are more
sensitive to circulating androgens.
Acne
and comedones tend to occur in sun-exposed areas and there is a distinct
possibility that Vitamin A depletion in these areas could be an
important cause of acne. Vitamin A
is
known to control sebaceous gland activity and the quality of the sebum
secreted. Part of this action seems to be due specifically to the normal
isomer of retinoic acid called cis-retinoic acid. Cis retinoic acid is
quite powerful at reducing the sensitivity of the sebocytes to
circulating androgens.
A
thickened horny layer is also instrumental in acne formation. People are
unaware that if they expose themselves to the sun, the UV light may well
kill off the bacteria and sterilise existing acne, but UV exposure
promotes a thickened horny layer of the skin and that thicker horny
layer can more easily obstruct the follicle of the sebaceous glands. In
Europe this is often called "Majorca acne" because many people
who go to sunbathe in Majorca develop acne a few weeks later.
Excessive
exfoliation of the horny layer may also lead to obstruction of the
follicle.
The
bacteria responsible for the degradation of the sebum are found on the
skins of people who do not have acne, and they probably play their role
only in the transformation of sebum into pus. These bacteria are
inversely controlled by the pH of the skin. Skin pH is usually between
4.5 to about 6.5.. The lower the pH, the better the acid mantle, and the
fewer bacteria are found.
THE
TREATMENT OF ACNE
While
we understand the basic principles of acne formation, we do not in fact
understand them well enough and that is why acne can still be very
difficult to treat. The skin care therapist cannot address the hormonal
problems leading to a change in the consistency of the sebum. However,
it is possible to influence most of the other important factors:
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Make
sure that the diet is healthy and suggest supplements of vitamins A,
B5, C, D, E, Zinc and Selenium.
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Reduce
the activity of the sebaceous glands.
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Reduce
the possibility of sebaceous gland obstruction.
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Dissolve
the keratin-sebum plugs.
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Prevent
infection by reducing the pH of the acid mantle to the lower normal
levels.
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Treat
the infection.
However,
the most important point to stress is that when the skin care therapist
treats acne, only the symptoms are treated. The basic physiological
reasons for acne may still exist. It is important to understand this
because even when acne has been ‘cured’ the conditions for it to
recur still exist. Acne treatment needs to last for many many years and
for this reason the therapy should also be kind to the skin and work
with the natural physiology of the skin.
DIETARY
SUPPLEMENTATION
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Diets
rich in saturated fat increase sebum production and may induce
acne. Recommend a low-fat, high-fiber, nutrient-dense diet that is
adequate in vitamins and minerals and low in sugar, and refined
foods. Fast foods should be avoided. Excessive iodine should also be
avoided as it may cause or exacerbate acneiform eruptions.
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Fast
food may be low in omega-6 essential fatty acids, and this might
account for follicular hyperkeratosis in acne. For that reason,
recommend flax seed oil to your clients.
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Vitamin
A supplementation has long been known to be effective against acne
(hence the popularity of cod liver oil in folk remedies. Because
surplus vitamin A circulating in the blood gets absorbed into the
liver after about 4 hours, I recommend that vitamin A should be
taken in divided doses: e.g. 10,000 i.u. Twice a day. There is no
danger of vitamin A intoxication at this dose. One would have to go
to doses of about 300,000 i.u. Daily for an extended period before
that becomes an unusual possibility.
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Dr L H
Leung from Hong Kong has suggested that mega-doses of vitamin B5
(pantothenic acid) may completely obliterate signs of acne. The
doses used were as much as 10 gms per day but effects were also seen
at 500 mg per day. Vitamin B5 is involved in energy
production from the metabolism of fats. Such high doses may cause
diarrhoea and there is a chance off a relative vitamin B1
deficiency that is easy to treat by eating nuts or red meat.
Recommend starting with Vitamin B5 100 mg twice and day and
increasing to higher doses.
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It is
not clear why this should happen but vitamin C supplementation of
1000 mg per day (which can for convenience be taken as 500 mg twice
a day) can cause a significant reduction of acne. This could be a
result of decreased lipid peroxidation and more stable sebum.
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Vitamin
E facilitates the absorption of vitamin A, and also assists the
action of selenium, which is involved, in the inflammatory response.
Supplementation of selenium increases the immune system and helps to
control infection. Recommend 200 micrograms of selenium, and 400 i.u.
Alpha tocopherol a day.
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Blood
levels of Zinc are often low in patients with acne so it is wise to
supplement about 15 mg per day.
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REDUCTION
OF SEBACEOUS GLAND HYPER-ACTIVITY
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Using
topical vitamin A either in the kinder cosmetic form or retinyl
palmitate or through the harsher medicinal form, retinoic acid, does
this best. In some people only a very low dose of vitamin A is
required to reduce the activity of the sebaceous glands and produce
less sebum. It seems that the nature of the sebum is also changed.
Whatever the nature of the acne that you are treating, always make
sure that topical vitamin A is part of the treatment because
ultimately, when the acne is controlled, one needs to promote a
healthier skin with controlled sebum production and one can only get
this from vitamin A.
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In
many people higher doses of vitamin A are needed before they reduce
the action of the sebaceous glands. In these cases, the therapist
should refer the client to a doctor who can prescribe cis-retinoic
acid to control the acne. These cases need a great deal of emotional
support and encouragement because cis-retinoic acid therapy may
cause depression.
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As we
know, the production of sebum is affected tremendously by hormones.
The therapist cannot really help in affecting hormonal problems, and
if the treatments are not being successful then the client should be
referred to a doctor for evaluation and treatment. Hormone therapy,
however, does have risks of causing or aggravating pigmentation
problems. However, the therapist can help by using plant-derived
anti-androgens in topical formulations. A most interesting
anti-androgen is glabridin which is a water soluble fraction derived
from liquorice. Glabridin reduces the effects of androgens on the
sebocytes and changes the quantity and nature of the sebum.
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REDUCE THE
POSSIBILITY OF SEBACEOUS GLAND OBSTRUCTION
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The
surface of the skin should be kept as smooth as possible. Topical
vitamin A is effective in compacting and smoothening the stratum
corneum. In fact what we are trying to achieve is a more controlled
release of the corneocytes on the surface of the stratum corneum.
Paradoxically, topical vitamin A may initially aggravate acne -
possibly as a result of speeding up the release of the uppermost
corneocytes by its action on the desmosomes of the horny layer.
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Alpha
hydroxy acids, and in particular, lactic acid and its salts also
help to produce a very smooth horny layer. Lactates are
fundamentally important in promoting skin hydration. The moister the
epidermis is, the smoother the surface will be.
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Exposure
to harsh UV rays should be reduced because this promotes a
thickened, basket-weave type of horny, layer with much more
exfoliation.
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The
thickened Horny layer can be treated with cosmetics or medications
containing benzoyl peroxide which smoothens the horny layer (and
also has an anti-septic effect).
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Salicylic
acid will also smoothen the horny layer.
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By
changing the nature of the sebum one could reduce the chance of
obstruction, however, again the skin care therapist cannot use
hormones.
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Do not
use scrubs to smoothen the skin because this may promote sebum
production.
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DISSOLVE
THE KERATIN PLUGS.
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Sensible
skin cleaning: Dried up sebum is like a wax, and in order to
dissolve it, one has to use a substance that dissolves oil.
Water-based products cannot do this. One could use alcohol, but
that would irritate skin and aggravate the condition. On the other
hand, highly refined mineral oil is able to dissolve sebum and it
should be used to help to clean out the obstructed follicle. It is
important to use it to carefully massage the skin and work the
plugs loose. A firm brush is useful for massaging mineral oil into
the follicles and the mechanical action will help to release the
attachment of the plugs to the sidewalls of the follicle. Then
wash off thoroughly with water or a cleanser. Try not to use harsh
soaps
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AHA
may also be useful in helping to get rid of the keratin plugs by
facilitating the breakdown of the corneo-desmosomes, and thereby
allowing release of the plug from the skin.
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Peeling
has a similar action, though one has to be sure that when
exfoliation occurs, that the surface is kept as smooth as
possible. However, remember to use an extremely mild scrub so that
you do not stimulate sebum production.
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PREVENTING
INFECTION BY REDUCING THE pH OF THE ACID MANTLE:
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Use an
acid based skin toner after cleansing. Lactic acid is useful and
tends to sting less than glycolic acid.
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Acid
peeling is a more dramatic lowering of the pH but this only lasts
for a limited time.
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TREAT THE
INFECTION
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Australian
tea tree oil is a powerful anti-septic that works at very low
concentrations. A few drops of tea tree oil can be dropped into a
bowl of water to wash the acne areas and this usually dries up the
infection within a very short time. I recommend tea tree oil based
products for cleansing and toning at least.
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Benzoyl-peroxide
is another power anti-septic and can be extremely useful and
should not be neglected in resistant cases.
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This
is the prime indication for peeling of the skin. Peeling can be
used as a "spot treatment" and will sterilise the acne
spots almost immediately (many people can feel that the pain in
the spot stops within 20 minutes of a treatment. However, this has
to be repeated for subsequent crops of acne until the basic skin
problem has become controlled. Once the skin is controlled then
peeling is no longer required. Peeling can also be very useful in
controlling the potential acne eruption when one starts applying
vitamin A creams.
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Skin
care therapists cannot use antibiotics but in some cases they are
essential to control the infection and the client should be
referred to a doctor.
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It
is important to understand that vitamin A applied topically is essential
for every acne case. That is the mainstay. If the acne does not respond
to this simple treatment then other modalities of treatment should be
added to the regime. AHA’s, benzoyl peroxide or salicylic acid should
be considered next and then if that does not succeed, peeling might
solve the problem. These treatments have minimal side effects, which are
reversible. Important point is that when we treat acne we only treat the
symptoms so the treatment must be long lasting. Another discouraging
fact is that generally the treatments for acne first make the condition
worse before the acne improves. This aggravated phase may last several
months.
If
the above regime is not adequate then do not hesitate to refer the
client to a doctor who may prescribe antibiotics, hormones or systemic
treatments with vitamin A (Roaccutane etc.). More than 80% people with
acne will respond to simpler treatments, so the skin therapist has a
very important role to play in treating acne.
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