It is called belly button which shows up outside on stomach.
These are called ulcers!
Gastric pit
A hole that develops in the lining of the stomach is called an ulcer. There are several types, named for their location and the depth of the ulcer.
A diabetic with a hole in the lining of their stomach
The stomach has a special mucus lining that is resistant to stomach acid. If a tiny hole develops in this mucus lining, the result can be an ulcer.
Cells in the stomach lining ooze mucus that neutralizes acid upon contact.
A hole in the stomach wall is known commonly as an ulcer. Ulcers are caused by an overabundance of hydrochloric acid within the stomach. The acid weakens the stomach lining and penetrates the stomach wall, causing ulcers.
The word sought may be ulcer (a hole or tear, especially in the stomach or lining of the mouth).
your stomach acid may be eating a hole in your stomach lining. If the pain is in your chest and throat it maybe acid reflux. There's pills for both
Your stomach has a mucus lining that protects it from the acid. Cells located in your stomach produce this lining.
Stomach ulcers occur when the thick layer of mucus that protects the stomach lining from stomach acids is reduced. They are easily cured medically, but can become serious without treatment. A hole in the stomach is called a perforation. It can result in the membrane that lines the abdominal cavity becoming inflamed, a condition called peritonitis, if bacteria, bile, or stomach acid enters the abdominal cavity. Perforation of the stomach is a medical emergency that can be life threatening.
The lining of the stomach has less surface area than the lining of the small intestine. The stomach lining has a mucus coating that protects it from acid while the lining of the small intestine is less coated.
why is the stomach lining undamaged by the hydrochloric acid
The damage section of stomach lining is actually the entire stomach. The stomach is very acidic, however, is covered with a very thick layer of mucus for protection. If the mucus disappears the stomach lining will be damaged by the acids.