Lesions are any type of damage or abnormality that occurs to tissue in the body. Lesions can be caused by a variety of factors, including infections, trauma, inflammation, and disease.
Infections
Infections are one of the most common causes of lesions. Bacterial infections, such as those caused by Streptococcus or Staphylococcus, can cause skin lesions. Viral infections, such as those caused by the herpes virus, can cause lesions in the mouth or genital area. Fungal infections, such as those caused by Candida, can cause lesions on the skin or in the mouth. Parasitic infections can also cause lesions, such as those caused by scabies.
Trauma
Trauma is another common cause of lesions. Traumatic injuries, such as scrapes and cuts, can cause skin lesions. More serious traumatic injuries, such as burns, can cause deeper, more extensive lesions. Lesions can also be caused by repeated trauma, such as a repeated blow to the same area of the body.
Inflammation
Inflammation is another cause of lesions. Inflammation occurs when the body's immune system overreacts to an injury, infection, or other trigger. This overreaction can cause swelling, redness, and heat in the affected area, as well as pain and tissue damage. Inflammation can cause skin lesions, as well as lesions in other tissues, such as the brain or lungs.
Disease
Disease is another common cause of lesions. Many diseases can cause lesions, including autoimmune diseases, such as lupus, and cancer. Diabetes can also cause skin lesions due to poor circulation. Lesions can also be caused by genetic conditions, such as neurofibromatosis.
