Here, we have allergic contact dermatitis.
As a differential,
your atopic dermatitis.
Your operative word
here will be contact.
Let’s take a look.
It’s a type 4 hypersensitivity.
So therefore, it would
a day to two days after the contact
to that particular antigen.
Poison ivy is the classic example
of allergic contact dermatitis.
The one that I’d given
you earlier is nickel.
Therefore, that patient who had
“allergies” to that nickel
then placed coins in
his or her jeans,
and if those tight jeans with the coins in
the pocket came in contact with the skin,
it may result in the
type 4 hypersensitivity,
which we then refer to as being
allergic contact dermatitis.
Common sources, increased
in workplace and hobbies
hobbies based on whatever type of
contact that you’re coming to.
So for example,
if you’re a wilderness person and
you’re out there in the wilderness
and forced to whatever, then
there’s every possibility
that you might come across such
plants, such as poison oak or ivy.
Morphology: Fairly well-demarcated
erythematous and weeping plaques,
as you can imagine,
may assume a linear distribution
when due to contact with plants.
And literally, meaning to say that if
you got stroked by your poison ivy,
then along that line that you got
stroked, guess what’s going to happen,
you’re going to develop this
type of, well, weeping plaques
that are extremely pruritic.
Are we clear?
What you want to keep in mind, obviously,
I’m going to give you differentials,
and as soon as you hear about
dermatitis in your head now,
you’re going to divide it
into contact or atopic.
And under atopic
dermatitis, remember there
that it was exposure to the antigen,
perhaps, to the environment.
And usually, with
you’re dealing with the triad of atopic
dermatitis, asthma, and rhinitis.
This is contact dermatitis.
The common allergens include nickel,
cheap jewelry, perhaps even.
So think about you’re going to a
party and your significant other
is now wearing whatever
type of imitation jewelry,
unbeknownst to him or her may
then develop contact dermatitis.
You have chromates from leather
or maybe perhaps neomycin,
especially when dealing with topical
antibiotics, and perhaps, from hair dye.
A very important one, which
is then your paraphenyl,
what’s known as your
aldimine type of hair dye.
Important, isn’t it?
All these things are extremely
common in our society.
If you then take a look at your
allergic contact dermatitis.
Here’s an individual
with poison ivy.
You’ll notice that upon exposure that
it’s almost like a linear type of pattern
based on where the patient got in
contact with this particular plant.
If you take a look at it, this
look like weeping type of plaques.
Your management here, withdrawal
of the offending allergen.
But you must find out as
to what that allergen is.
Topical steroids for
local type of reaction,
and systemic steroids if
there is widespread disease
which is always a possibility.