Skin
cancer
Skin cancer begins when normal cell
growth goes wrong and disorderly. Overgrowth occurs forming tumors
which can be benign or malignant. Benign growths can often be
removed, rarely grow back, and do not spread or invade other areas
of the body. Malignant growths are more serious than benign
growths. They can be removed, sometimes grow back. They can invade
and damage nearby tissue and organs, spread/metastasize.
Causes
- chronic exposure to ultraviolet (UV) radiation present in
sunlight is responsible for the induction of most nonmelanoma skin
cancer (NMSC) in humans.
- Wavelengths in the UV-B (290–320 nm) region of the solar
spectrum are absorbed into the skin, producing erythema,burns,and
eventually skin cancer.
Pathophysiology
- The first step in UV skin carcinogenesis involves the induction
of DNA damage. Occasional mistakes during the repair of this damage
leads to the incorporation of wrong bases into the genetic
material.
- The DNA damage that is left unrepaired may also disrupt
cellular processes by obstructing the DNA and RNA synthesizing
machineries and introduce wrong bases into the DNA.
- These types of mistakes often result in mutation leading to
loss or inappropriate expression of affected genes.
ABCD Rule of Skin
Cancer
The ABCDE Rule of skin cancer is not meant to be a tool for
diagnosis but rather one by which individuals and health
professionals can differentiate between a problem growth and a
simple, everyday blemish.
The ABCDE Rule is broken down as follows:
A for
Asymmetry
- Draw a line through the center, you would have two symmetrical
halves. In cases of skin cancer, spots will not look the same on
both sides. (Shape alone doesn’t suggest a malignancy, since some
birthmarks will irregular in shape, but is certainly one of the
features when identifying skin cancers.)
B for
Border
- Those with a blurry and/or jagged edge can be a sign of a
cancerous or pre-cancerous growth.
- The borders of an early melanoma tend to be uneven. The edges
may be scalloped or notched.
- A benign mole has smooth, even borders, unlike melanomas
C for
Color
- A mole that has more than one color should be considered
suspicious.
- Normal moles and spots, by contrast, are usually one
color.
- Color changes can include the darkening of a spot (sometimes to
dark purple to black) or a lightening in certain parts of the
growth.
D for
Diameter
- If a growth is larger than a pencil eraser (about 1/4 inch or
6mm), it needs to be checked by a doctor.
- This includes areas of skin that do not have any other
abnormalities in terms of color, border, or asymmetry.
- This is not to suggest that smaller growths don't warrant
investigation — including skin tags (acrochordons) — but those over
1/4 inches will always be of particular concern.
E for
Elevation
- Elevation means that the mole or growth is raised and has an
uneven surface. I
- it is both the irregularity of the surface and changes in size
that should raise the red flag, particularly if the growth
different from any other blemish on the body
- Based on ABCDE rule can diagnose the cancer, either it benign
or malignant or it belong to which type of cancer ,
- Basal Cell Cancer- most common on face, sun affected areas,
rarely spreads.
- Squamous Cell Cancer -also sun affected areas but many not be
sun area, may spread to lymph nodes.
- Melanoma- Lethal type of cancer aminly caused by UV
radiation.