The length of time it takes for your poison ivy rash to heal
really depends on your body's immune system. Some people can clear
up in days, some take up to a month. A few important things
If your rash isn't spreading, then you shouldn't have to keep
washing with Tecnu. If your rash is spreading, that
means you are coming in contact with the plant's urushiol oil
again. Usually recontamination (if you haven't been around the
plants again) happens because you are picking it up off an object
that has been in contact with the plant oil such as gloves,
gardening tools, mountain bike, pet's fur, etc.. Those items may
need to be
washed as well.
If the rash isn't spreading but it is getting worse, you may
want to consult a physician. Signs of infection can include
very red skin, puss, swelling, fever and pain.
If the rash isn't getting worse, it may just be that your body
needs a little time to heal.