<unk>  causes an eczematous contact dermatitis characterized by redness, swelling, papules, vesicles, blisters, and streaking. People vary greatly in their sensitivity to<unk> . In approximately 15% to 30% of people,<unk>  does not trigger an immune system response, while at least 25% of people have a very strong immune response resulting in severe symptoms. The rash takes one to two weeks to run its course and may cause scars, depending on the severity of the exposure. Severe cases involve small (1–2 mm), clear, fluid-filled blisters on the skin. Pus-filled vesicles containing a whitish fluid may indicate an infection. Most poison ivy rashes, without infections, will resolve within 14 days without treatment. Excessive scratching may result in infection, commonly by staphylococcal and streptococcal species; these may require antibiotics. File:Severe allergic reaction to<unk>  (poison oak) 4 days after exposure.Severe allergic reaction to<unk>  (poison oak) 4 days after exposure. File:URUSHIOL BLISTERING.Blistering 48 hours after<unk>  contact. File:Poisonivyrash.Poison ivy rash after 2 days. File:Poison ivy with swelling.Poison ivy rash with swelling about 3 days after direct contact.
Urushiol-induced contact dermatitis
Phototoxic tar dermatitis
Allergic contact dermatitis
Blister beetle dermatitis
Autosensitization dermatitis
Rodent mite dermatitis
Contact dermatitis
Irritant contact dermatitis