O
Occupational
dermatitis
| Onychogryposis | Onycholysis
| Onychomycosis | Ota's naevus (go
to naevus of Ota)
OCCUPATIONAL DERMATITIS
This is a type of contact dermatitis that
is caused by or aggravated by the work environment. It may affect
workers in any industry but is more common in those working in
the construction, electrical and engineering industries.
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ONYCHOGRYPOSIS
This is an unusual
horn-like overgrowth of the nails, usually the toenails.
Causes
- Trauma.
- Tight shoes.
- Hereditary.
- Circulatory problems.
Symptoms
- The nail becomes curved,
discoloured and thickened rather like a ram's horn.
What you can do
- Wear proper fitting
shoes.
- Consuly a doctor.
- Have a chiropodist
trim the hard deformed nail regularly.
What the doctor
may do
- Remove the abnormal
nail surgically.
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ONYCHOLYSIS
Onycholysis refers
to a separation of the nail plate from the nail bed.
Causes
- Excessive contact
with water.
- Trauma from tight
shoes and poor manicuring.
- Allergy to nail cosmetics.
- Drugs such as tetracycline
and thiazide diuretics which may cause photo-onycholysis (sun-activated
onycholysis).
- Fungal infection (see
onychomycosis).
- Skin disorders such
as psoriasis and lichen
planus.
- Overactive or underactive
thyroid gland.
- Circulatory problems.
- Idiopathic (of unknown
cause).
Symptoms
- Lifting of the nail
plate which becomes white and opaque initially.
- Eventually, dirt accumulates
underneath the nail plate which becomes thickened and discoloured.
Complications
- Secondary invasion
by fungi, especially Candida
albicans and other yeastlike fungi.
- Secondary bacterial
infection.
What you can do
- You should consult
a doctor.
- Cut back the nail
so that the area underneath can be cleaned.
- Immerse the finger
into mild detergent solution after cutting the nail back and
gently clean away any accumulated debris. Do not use nail files
of toothpicks as this causes more separation.
- After cleansing, dry
the area well.
- Minimise contact with
water (see hand eczema).
What the doctor
may do
- Determine the cause
and treat accordingly.
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ONYCHOMYCOSIS
Onychomycosis (tinea
ungium) is a fungal infection of the nails. It needs to be differentiated
from psoriasis, eczema of the fingers/toes and candidal paronychia
which may all produce similar nail changes.
Cause
- Fungi, including Candida albicans and other
yeastlike fungi.
Symptoms
- Opaque white patches
at the sides of the free edge of the nail which becomes yellow
and then brown with time.
- Keratin (dead horn
cells) and debris accumulate under the nails.
- Nail plate becomes
discoloured, thickened, deformed and brittle and may loosen.
- Paronychia
(inflamed nail
folds) commonly accompanies onychomycosis caused by Candida
albicans and other yeasts.
|
Tinea ungium.
Click
on image for larger view |
Complications
- Secondary bacterial
infection and paronychia.
- What you can do
- You should consult
a doctor as oral antifungals are required.
- Keep the nails short.
- Wear proper fitting
shoes if the toe nails are involved.
- Adopt the same measures
for tinea pedis.
What the doctor
may do
- Take nail clippings
and/debris for microscopic examination and/or culture for fungus.
- Prescribe oral antifungal
drugs - 6 to 8 months for fingernail infections and 12 to 18
months for toenail infections. The duration of treatment is shorter
with the newer antifungal agents.
- Removal of the nail
may be helpful in very resistant cases.
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