Clay is particularly effective in drawing out the toxins from bites and stings that cause a skin rash. Clay is also effective in neutralizing the oils from plants that cause skin rashes. It will help relieve the itching and pain and speed the healing. Bentonite and Montmorillonite clays are particularly effective. Mix some clay with cold, clean water (filtered is best) to make a smooth paste and apply a thin layer to the affected area. Allow to dry, then gently rinse off. You can also spread some onto a clean, soft cloth and gently bind the affected area. Cover with plastic to prevent it drying out too quickly. Whichever method you use, reapply every few hours until the rash has subsided.