Poison ivy, oak, sumac dermatitis in Infant/Neonate
These species show regional variations in the nature of the plant including growth pattern, leaf characteristics, and flowering.
After exposure to urushiol, the rash begins to appear within 1-2 days in previously sensitized individuals; in the newly sensitized, it may be delayed 2-3 weeks. As the resin is very stable, occult contact may occur from contaminated clothing, gear, or vegetation, even after months have elapsed. In this age group the most common mode of contact is secondary from family members, caregivers, or pets.
L23.7 – Allergic contact dermatitis due to plants, except food
200823002 – Allergic dermatitis due to poison ivy
Differential Diagnosis & Pitfalls
- Phytophotodermatitis – Similar presentation but due to plant material and ultraviolet (UV) exposure. Hogweed, citrus fruits, celery, wild parsnip, wild carrots, and oil of bergamot are among the more common causes.
- Dermatitis due to other Anacardiaceae genera – mango, cashew, pistachio
- Allergic contact dermatitis to some other antigen
- Arthropod bite or sting reaction – Exaggerated vesiculobullous reactions may be associated with chronic lymphocytic leukemia, other hematological malignancies, and HIV.
- Bullous impetigo – more scattered, fragile bullae; golden crusts
- Scabies – rarely vesicular
- Autoimmune blistering diseases (maternally transmitted) – pemphigus group, pemphigoid, and linear IgA dermatosis
- Atopic dermatitis
- Nummular dermatitis
- Melanocytic lesions, including melanoma