Make a paste using water and about 1/4 teaspoon of baking soda. Put this paste on a bandage and apply the bandage to the affected area. After 24 hours, remove the bandage. The splinter may be sticking out of the skin. If it's visible, pick it off. Rinse the skin gently (if the splinter is sticking out but not visible, this may wash it away). Repeat the method with new paste and another bandage every 24 hours until the splinter is gone.