(HealthDay News) -- Lichen planus is a disease that results in a rash on the skin or inside the mouth. While its exact cause isn't known, it's believed triggered by an allergic or immune system reaction.

(HealthDay News) -- Chickenpox is a viral disease that isn't serious for most people. But it can be dangerous to a pregnant woman, who is at risk for more complications than if she weren't pregnant, and her fetus, who may be at greater risk of birth defects.

FRIDAY, Dec. 10 (HealthDay News) -- Children and teens accounted for 48 percent of the 54,983 exercise-related heat injuries that were treated in U.S. emergency departments between 1997 and 2006, a new study shows.

FRIDAY, Dec. 10 (HealthDay News) -- Toddlers who play with different-shaped objects learn new words twice as fast as those who play with objects that have similar shapes, a new study finds.

FRIDAY, Dec. 10 (HealthDay News) -- A new study challenges the theory that lowering the minimum legal drinking age from 21 to 18 would help curb binge drinking by college students.

FRIDAY, Dec. 10 (HealthDay News) -- Human milk has long been considered nature's ideal nourishment for babies.

FRIDAY, Dec. 10 (HealthDay News) -- Patients diagnosed with a genetic condition known as Cowden syndrome face an increased risk for colon cancer, new research suggests.

FRIDAY, Dec. 10 (HealthDay News) -- Most people probably find drinking a milkshake a pleasurable experience, sometimes highly so. But apparently that's less apt to be the case among those who are overweight or obese.

FRIDAY, Dec. 10 (HealthDay News) -- People who engage in Zen meditation do feel pain, new research reveals, but they don't think about it as much.

FRIDAY, Dec. 10 (HealthDay News) -- Americans who live in walkable neighborhoods are more involved in their communities, more trusting and have a higher quality of life, a new study suggests.

FRIDAY, Dec. 10 (HealthDay News) -- Sleep deprivation may be therapeutic for some people with post-traumatic stress syndrome (PTSD) and other anxiety disorders, a new study suggests.

FRIDAY, Dec. 10 (HealthDay News) -- Frequent sex can help neurotic newlyweds achieve the same level of marital bliss as other newlyweds, a new study finds.

FRIDAY, Dec. 10 (HealthDay News) -- High levels of breast cancer tumor cells circulating in the blood during the first round of chemotherapy are a sign that the patient may not do well in the long run.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

(HealthDay News) -- Here are the latest clinical trials, courtesy of ClinicalConnection.com:

FRIDAY, Dec. 10 (HealthDay News) -- Combinations of targeted therapies for an especially aggressive type of breast cancer could potentially usher the majority of affected patients into remission, researchers at a major breast cancer meeting said Friday.