Lyme Disease – Definition
Lyme disease is a bacterial infection. The infection is spread from the bite of an infected deer tick.
Lyme Disease – Causes
Lyme disease is caused by a bacteria found in some deer ticks. An infected tick passes Lyme disease to humans through its bite.
If untreated, the bacteria can pass into the blood. The blood will carry it through the body. The bacteria may then settle in various body tissue. The spread of the infection can cause a number of symptoms, ranging from mild to severe.
Kaposi’s Sarcoma – Definition
Kaposi’s sarcoma (KS) is a form of cancer. It affects the blood vessels. It can cause lesions on the skin, mucus membranes, or internal organs. It occurs most commonly in the gastrointestinal tract and lungs.
Cancer occurs when cells in the body divide without control or order. If cells keep dividing uncontrollably, a mass of tissue forms. This is called a growth or tumor. The term cancer refers to malignant tumors. They can invade nearby tissue and spread to other parts of the body.
KS can be classified according to the group of people that it affects:
- Classic — usually affects men of Mediterranean descent
- Endemic — usually affects people living in equatorial Africa
- Transplant-related (acquired) — affects people who have received an organ transplant
- AIDS-related (epidemic) — affects people with AIDS
(Fish Scale Disease; Xeroderma)
Ichthyosis – Definition
Ichthyosis is a dry skin condition. There are two general types:
- Inherited ichthyosis (several forms exist) — dryness and scaling of the skin due to hereditary factors
- Acquired ichthyosis — thickening and scaling of the skin that is not inherited but is associated with certain medical disorders
Ichthyosis – Causes
Inherited ichthyosis is caused by a genetic defect that is passed from parent to child or that occurs spontaneously.
Acquired ichthyosis is relatively rare, but may be caused by any of the following:
- Leprosy (extremely rare in the US)
- Underactive thyroid
- Lymphoma ( Hodgkin’s, Non-Hodgkin’s)