Signs and symptoms of contact dermatitis vary widely and may include:
The rash can develop within minutes to hours of exposure, and it can last 2 to 4 weeks. For example, the rash may show up along a leg that brushed against poison ivy.
Here, the blisters are caused by contact with the oily substance in poison ivy (urushiol) that causes allergic reactions.Ĭontact dermatitis shows up on skin that has been directly exposed to the substance causing the reaction.
