Poison ivy blisters may occur if manipulated excessively or picked at. The blisters might actually scar or leave post-inflammatory hyperpigmentation. However, most cases of poison ivy go away on their own in one to three weeks. After about a week, the blisters begin to dry up and the rash starts to resolve or fade on its own. However, severe cases may last longer than a week, have worsening symptoms and may cover a greater surface area of the body.
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