- Can be in response to any allergen, including: nickel, hair dyes, plant toxins (poison ivy or oak), and many other substance
- Acute, erythematous, itchy, burning, following contact w/something patient is allergic to
- Typically occurs w/in 1-3d of exposure
- May have past hx of similar rxn if prior exposure
- Appearance on skin follows pattern of contact
- Erythema, edema, blisters
- Excoriations w/itching