Rash From Potting Soil . Hello debidums an allergic reaction is when the body releases histimines usually after the second exposure to the substance. You can also add some perlite to. Discovering the Origin of Your Skin Reaction from lifeallergies.blogspot.com Fortunately, using hydrogen peroxide to get rid of bugs in houseplant soil is simple. If the reaction is only on your hands and arms which contact the soil. However, it is advisable to clean your hands properly after gardening, because dirty hands can spread germs to the eyes, nose and.