Botulism is a rare but serious paralytic illness caused by a nerve toxin produced by the bacterium Clostridium botulinum (klos-trih-dee-um bot-u-li-num). Human botulism is mainly caused by four of the seven recognized types of Clostridium botulinum bacteria: types A, E, rarely F and possibly G. The recorded history of botulism began in 1735, when the disease was first associated with the consumption of sausage.
Warts occur in a variety of shapes and sizes. A wart may appear as a bump with a rough surface, or it may be flat and smooth. Tiny blood vessels (capillaries) grow into the core of the wart to supply it with blood.
Symptoms of warts. 1  A small, raised bump may appear on the skin. 2  The average size can range from one to 10 millimetres. 3  The wart may have a rough or smooth surface. 4  Warts can occur singly or in clusters. 5  In some cases, the wart may itch. 6  Face, feet, knees and hands are most commonly affected.