Chitin is a primary component in the exoskeletons of arthropods and crustaceans and is also found in the cell walls of fungi. It's a polysaccharide, and it's excreted by the epidermal cells in arthropods.
Definition & Facts. Hemorrhoids, also called piles, are swollen and inflamed veins around your anus or in your lower rectum. External hemorrhoids form under the skin around the anus. Internal hemorrhoids form in the lining of the anus and lower rectum.
Hemorrhoids are veins in the wall in your rectum and anus that have become twisted, swollen, and inflamed. They can form either internally or externally, and the resulting lumps can cause pain and bleeding.f your hemorrhoids are external, your symptoms can include swelling or a lump (blood clot) around your anus. These are referred to as thrombosed external hemorrhoids, and can be quite painful. Depending on your toilet habits, you can aggravate your problem, causing additional irritation, bleeding, and itching.