Yes. Brother in army showed me when I got bit.You cut the end off of the potato. The potato sucks out the
poison. Step 1.) hold the potato end on affected area.
Step 2.) use pressure,and leave on for 5 mins. after 5 mins you should see a dark ring around the middle of the potato end. Step 3.) If not apply longer. In all my cases this has worked. However if this does not work for you and you are having sever symptoms or bruising please go to the nearest E.R.