What is an ulcer or sore?

Ulcer derives from the Latin ulcus, this is a delimited lesion, similar to a crater in the skin or mucous membranes and is produced by cell death that is associated with some inflammations and infections.
There are many types of ulcer such as:
Callous ulcer, thick margins that do not stretch and hard base, does not circulate blood and is associated with edema (accumulation of fluid) in the legs.

Leg ulcer, which is characterized by non-healing, and is presented by varicose veins or circulation obstacles.
Gastric or duodenal ulcer is an erosion located in the stomach lining and penetrating the muscular layer and perforating the stomach wall. They increase with stress or tension, producing symptoms such as pain and nausea, especially when there is no food in the stomach; antacids or milk quickly relieve pain.
Ulcers are distinguished by the severity of the injury.
1.- First degree ulcers, in which the skin becomes red, and the redness is not lost when a pressure placed on the skin is removed.
2.- Second degree ulcers, in which vesicles form and the skin cracks.

3.- Third degree ulcer, in this there is a break in the skin with death of the subcutaneous cellular tissue forming crusts called eschar.
4.- Fourth degree ulcer is when cell death reaches the muscle or even the bone, almost permanently damaging vessels and nerves.
In their first stages, first and second degree, they can be cured with curatives. More serious ulcers are usually healed by surgery.
Prevention is the best way to control them. Creams and sunscreens can be used on the skin for prevention, and medical check-ups are recommended as soon as visible veins are present on the skin.
For internal ulcers, prevention consists of stopping consuming irritating foods, and taking medications to control and heal the tissue, sometimes avoiding surgery.