Acrokeratosis verruciformis of Hopf is a rare skin disorder characterized by wart-like lesions on the hands and feet. It is caused by a mutation in the gene that codes for the protein keratin. The lesions are usually painless and may be present at...

Acromegaly is a rare disorder caused by an excess of growth hormone in the body. It is usually caused by a benign tumor on the pituitary gland, which is located at the base of the brain. Symptoms of acromegaly include enlargement of the hands, fee...

Acromelanosis is a rare skin disorder characterized by the presence of dark, pigmented patches on the skin. These patches are usually found on the face, neck, and hands, and can range in color from light brown to black. The cause of acromelanosis ...

Acromelic frontonasal dysplasia is a rare genetic disorder that affects the development of the face, head, and limbs. It is characterized by a wide forehead, a flat nasal bridge, a wide nasal tip, and a wide mouth. Other features may include a cle...

Acromesomelic dysplasia is a rare genetic disorder that affects the growth of bones in the arms and legs. It is characterized by short stature, short limbs, and abnormal bone development. People with this disorder may also have other physical abno...

Acromesomelic dysplasia, Grebe type is a rare genetic disorder characterized by short stature, skeletal abnormalities, and facial dysmorphism. It is caused by a mutation in the TRIP11 gene, which is responsible for the production of a protein invo...

Acromesomelic dysplasia, Hunter-Thompson type is a rare genetic disorder characterized by short stature, skeletal abnormalities, and facial features. It is caused by a mutation in the TRIP11 gene, which is responsible for the production of a prote...

Acromesomelic dysplasia, Maroteaux type is a rare genetic disorder characterized by short stature, skeletal abnormalities, and distinctive facial features. It is caused by a mutation in the TRPV4 gene, which is responsible for the production of a ...

Acromicric dysplasia is a rare genetic disorder that affects the growth of bones and cartilage. It is characterized by short stature, short hands and feet, and a distinctive facial appearance. Other features may include joint stiffness, hearing lo...

Acroosteolysis-keloid-like lesions-premature aging syndrome (AKLPAS) is a rare genetic disorder characterized by the development of abnormal bone growths (acroosteolysis) and keloid-like lesions on the skin. It is also associated with premature ag...

Acrootoocular syndrome is a rare genetic disorder characterized by the presence of facial abnormalities, including a wide-set eyes, a flat nasal bridge, and a small chin. It is also associated with a number of other physical and developmental abno...

Acropectoral syndrome is a rare genetic disorder characterized by the presence of extra fingers and toes (polydactyly), as well as abnormalities of the chest wall and shoulder girdle. It is caused by a mutation in the HOXD13 gene. Symptoms may inc...

Acropectorovertebral dysplasia is a rare genetic disorder that affects the development of the bones in the arms, legs, and spine. It is characterized by short stature, short arms and legs, and a curved spine. Other features may include joint stiff...

Acrorenal syndrome is a rare genetic disorder that affects the development of the kidneys and the extremities. It is characterized by the presence of abnormal kidneys, short stature, and malformations of the hands and feet. It is caused by a mutat...

ACTH deficiency is a rare disorder caused by a lack of the hormone adrenocorticotropic hormone (ACTH). This hormone is produced by the pituitary gland and is responsible for stimulating the adrenal glands to produce cortisol, a hormone that helps ...

An actinic keratosis (ak-TIN-ik ker-uh-TOE-sis) is a rough, scaly patch on your skin that develops from years of exposure to the sun. It's most commonly found on your face, lips, ears, back of your hands, forearms, scalp or neck. Also know...