Allergic Contact Dermatitis

by Carlo Raj, MD

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    Here, we have allergic contact dermatitis. As a differential, your atopic dermatitis. Your operative word here will be contact. What happened? Let’s take a look. It’s a type 4 hypersensitivity. So therefore, it would appear approximately 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, intensely pruritic 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 atopic dermatitis, you’re dealing...

    About the Lecture

    The lecture Allergic Contact Dermatitis by Carlo Raj, MD is from the course Inflammatory Skin Diseases.

    Included Quiz Questions

    1. Systemic steroids
    2. Anti-itch agents
    3. Oral antibiotics
    4. IV antibiotics
    5. Topical steroids and antibiotics
    1. Allergic contact dermatitis
    2. Atopic dermatitis
    3. Type II hypersensitivity reaction
    4. Type I hypersensitivity reaction
    5. Type III hypersensitivity reaction

    Author of lecture Allergic Contact Dermatitis

     Carlo Raj, MD

    Carlo Raj, MD

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