Why certain human has birth mark on their body and other do not have it, what is the reason?

Answer 1

Birthmarks get their name for one simple reason: They are marks that are present on the skin of a lot of newborn babies! A baby can develop birthmarks either before he or she is born or soon after birth.

One of the most common types of birthmarks is called a hemangioma (say: he-man-jee-o-muh). These birthmarks happen when many new blood vessels group together in one place on the skin. Blood vessels are tiny tubes that carry blood through the body.

No one knows what causes blood vessels to group together, but it's good to know that most birthmarks don't hurt at all and they usually aren't a sign of any kind of illness. Lots of newborns have these birthmarks on the back of the neck (where they're called stork bites) or between the eyebrows (where they're called angel kisses). These birthmarks usually disappear within the first few weeks or months of life.

Types of Hemangiomas
One kind of hemangioma is called a strawberry hemangioma. If you think it gets its name from the fruit, you're right. A strawberry hemangioma is bright red and sticks out of the skin, so it does look a little bit like a strawberry. Some strawberry hemangiomas go away on their own by the time a kid is about 5 years old. Almost all strawberry hemangiomas go away by themselves by the time a kid is about 9 years old.

There is another type of hemangioma that is beneath the outer layer of skin. It's called a cavernous (say: ka-vur-nus) hemangioma. Cavernous means "like a cave," which is deep in the earth, like this type of birthmark is deep beneath the outer layer of skin. This kind of birthmark is puffier than a strawberry hemangioma. It's also a different color: not red like a strawberry, but more bluish-red. Cavernous hemangiomas usually don't go away by themselves.

Port-Wine Stains
Another kind of hemangioma is a port-wine stain. This isn't puffy or raised like a strawberry or cavernous hemangioma - it's level with the outer layer of skin. A port-wine stain is an area of skin that is either maroon (a purplish-red color) or dark red. It gets its name from port wine, a type of wine that is dark maroon. Kids who have port-wine stains usually have them on the face and neck.

Doctors can sometimes use laser surgery to treat birthmarks so that they can't be seen as much. It's important to remember, though, that birthmarks really aren't a big deal and kids who have them aren't any different from kids who don't.

P.S. - If you have had any brown, blue, or black spots on your skin since birth, they are probably types of moles! Moles are tiny collections of pigment cells - cells that contain color. Like other birthmarks, moles don't hurt and usually aren't a sign of illness in kids. Sometimes they're even called beauty marks or beauty spots. But if you have questions about a mole or birthmark on your body, feel free to ask your doctor about it.

Answer 2

A birthmark is a blemish on the skin formed before birth. They are part of the group of skin lesions known as naevi. The cause of birthmarks is unknown, but may include cellular damage due to radiation or chemicals. Some types seem to run in families.

Answer 3

Genetics mostly. I do believe birth marks are a Recessive Trait. Remember hearing/reading that somewhere.

Answer 4

Whenever a fetus in in vetro is developing some times the fetus gets little blood clots on certain parts of the body.Whenever these clots don't dissolve they become pegmented on the skin and stay there.

Answer 5

Birthmark is a general term for any skin abnormality. They range from freckles to port wine stains. Most of these marks are large deposits of the pigment melanin. Melanin is what gives us our skin color. Without it we would be albinos. Its main purpose is to protect us from harmful ultraviolet radiation. I believe genetics has a role in the formation of these deposits. Most of the time you can see a family resemblance in number and position of moles in its members. Best thing to do is stay out of the sun, watch for any changes in size and shape and wear sunscreen when you go out.

Answer 6

Birth marks are part of a physical road-map describing the galaxies we come from, so we can find our way back home. The other markers are freckles and moles. Blemishes don't count--they are just comets and asteroids--cosmic transients.

Answer 7

its where the cells in certain areas have not developed fully and it makes a mark on the person

Answer 8

Beside genetic and generic similarities each human has an individuality of its complete genetic makeup hence it shows individual characteristics.

Answer 9

ITS THE MARK OF THE DEVIL. Or probably just a skin defect.

Answer 10

Birthmarks are simply genetic like all inherited characteristics.