Poison ivy, oak, and sumac: When does the rash appear?
The amount of time it takes for a rash to appear depends on whether you’ve had a rash from one of the plants before. Here’s the general rule: Previous rash from poison ivy, oak, or sumac: A rash usually appears within 4 to 48 hours. Never had a rash from poison ivy, oak, or sumac: It typically takes 2 to 3 weeks.
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