The first skin disease that I discuss here is called impetigo. It is a bacterial infection which is caused by the bacterium staphylococcus aureus. This disease occurs in children primarily on the face. It can spread to other sites of the body by scratching. This disease in contagious and is transmitted from person to person by skin contact.
Infection of hair follicles can occur with the bacterium staphylococcus aureus causing folliculitis. It can occur wherever in the body where there is hair. It produces acute inflammation with pain and swelling and edema of the skin.
Furuncle and carbuncle are two types of infection that afflict the hair follicles. Furuncle being more superficial while carbuncle occurs in the subcutaneous layer of the skin. Carbuncle is common among diabetic patients and can predispose to infection of the blood or bacteremia.
The next skin disease that I discuss here is called hidradenitis suppurativa. This is an infection of the apocrine skin glands. These glands are characterized by their sweat secretion. This infection is caused also by staphylococcus aureus bacteria. The common site of infection in this disease is the axilla and the genital region in particular the anogenital region.
Erysipelas is the next skin bacterial infection that I discuss here. It is commonly caused by the bacterium streptococcus. The sites of infection are usually the face and scalp. It differs that furuncle and carbuncle by the fact that it is a dermal infection on the dermal layer of the skin. The skin shows in this infection reddness and swelling with hyperemia in the dermis. In addition there are systemic symptoms such as fever and acute inflammation.
Cellulitis is the next skin disorder that is discussed here. It is usually caused as a complication of skin wound infections. The bacteria that is responsible for triggering this disease is called streptococcus pyogens. There is inflammation of the affected area with reddness and heat on the skin. There is also an accompanying bacteremia with fever.
The next skin infection that is discussed here is called necrotizing fasciitis. This is an uncommon disorder that occurs in the deep layer of the skin including deep fascia in addition to involvement of subcutaneous skeletal muscles. The usual site of infection is the extremeties and abdominal wall.
This infection is usually caused by anaerobic bacteria. The characteristics of this infection include necrosis of the affected muscles and fascia and the skin covering them.
Anthrax is another disease that is caused by the bacteria bacillus anthracis. It is a spore forming gram positive bacteria that is usually found in farm animals. This disease is characterized by necrotizing skin with hemorrhage and acute inflammation of the affected skin.
The last skin infection that I discuss here is called leprosy. There are two types of leprosy. These are called: tuberculoid leprosy and lepromatous leprosy. Leprosy is a common disorder in the tropical regions and is caused by mycobacterium leprae.
Tuberculoid leprosy occurs in patients who have hypersensitivity to T-cells which are triggered against the bacteria. The clinical picture of this disease is hypopigmented macules that appear on the skin. There is in this disease nerve involvement such as the ulnar nerve THere is in this disease thickening of the skin and nerve palsy.
Lepromatous leprosy occurs in people with low level of activity of their immune system. In this condition the bacteria infect in addition to the skin the blood which can cause eye involvement in addition to lung and testis involvement.
The optimal temperature for the grow of this bacterium is below 37 degrees celcius. Therefore organs of the body such as the liver and spleen which are at 37 degrees temperature are not affected. Lepromatous leprosy is a serious medical condition that can cause massive tissue destruction in the body of the affected areas. Disfigurement is usually present due to involvement of the fingers and the nose and ears of affected individuals.