Number sign. Not to be confused with the Chinese character äº, the sharp sign (â¯), the viewdata square (â), the numero sign (â), the equal and parallel to symbol (â) or the game Tic-tac-toe's grid. The symbol # is most commonly known as the number sign, hash, or pound sign.
The poison ivy rash is not contagious. When a person touches the poison ivy leaf, a substance on the surface of the leaf (a resin) rubs off. Over the next 48 to 72 hours the skin reacts to the resin by becoming red and developing bumps and blisters at and around the site where the resin was.
No, the poison ivy blisters are the caused by the body's natural allergic reaction to the plants. If the blisters break and ooze, the fluid does not contain the oil that causes spreading. The rash-causing oil, called urushiol, from the original contact with poison oak and poison ivy will continue spreading (unless removed) for the first one or two days. It is found in in all parts of poison ivy, oak and sumac plants whether dead, dormant or thriving.