Contact dermatitis shows up on skin that has been directly exposed to the substance causing the reaction. For example, the rash may show up along a leg that brushed against poison ivy. The rash can develop within minutes to hours of exposure, and it can last 2 to 4 weeks.
Signs and symptoms of contact dermatitis vary widely and may include:
An itchy rash
Dry, cracked, scaly skin
Bumps and blisters, sometimes with oozing and crusting
Swelling, burning or tenderness
Source: mayo clinic
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