Cysts can feel tender to the touch, and a person may be able to move one easily. Tumors can also grow almost anywhere in the body. They tend to grow quickly and are usually firm to the touch.
Tests that diagnose cysts or tumors
Your doctor will probably order at least one imaging test to look at that lump or bump. You may need: Ultrasound: This test uses sound waves to determine if the mass is filled with fluid or is solid. CT scan: This detailed X-ray produces 3D images of the inside of your body.
An infection or abscess is perhaps the most common cause behind a mass that is mistaken for a tumor. In addition, cysts may arise from inflamed joints or tendons as a result of injury or degeneration. Inflammatory conditions, such as rheumatoid arthritis, can also result in soft tissue masses.
A cyst is a sac of tissue that's filled with another substance, like air or fluid. Tumors are solid masses of tissue. Cysts can form anywhere on the body, including on your bones and soft tissue. Most cysts are non-cancerous, but there are exceptions.
For example, most waves pass through a fluid-filled cyst and send back very few or faint echoes, which look black on the display screen. On the other hand, waves will bounce off a solid tumor, creating a pattern of echoes that the computer will interpret as a lighter-colored image.
Benign masses are more likely to be painful to the touch, such as with an abscess. Benign tumors also tend to grow more slowly, and many are smaller than 5 cm (2 inches) at their longest point. Sarcomas (cancerous growths) more often are painless.
Most cysts are benign (non-cancerous), but some are cancerous or precancerous and must be removed. In addition, if a cyst is filled with pus, that means it's infected and could form an abscess, so you should see a doctor if you feel pain when you touch a cyst.
You may be able to see a growth. Certain things about the image might even suggest that it's likely to be cancerous. But there are many benign (noncancerous) tumors that look very much like cancerous growths. That's why, if your doctor suspects cancer from imaging, they will almost always follow up with a biopsy.
They may seem to appear overnight. Cysts are rarely cancerous (malignant) and may be caused by blocked breast glands. Cysts can feel either soft or hard. When close to the surface of the breast, cysts can feel like a large blister, smooth on the outside, but fluid-filled on the inside.
Sometimes, an ovarian cyst is found or suspected during a pelvic examination. However, an imaging test is necessary to confirm the diagnosis. Blood tests may also be done depending on the situation. Imaging tests — The imaging test most commonly used is a pelvic or "transvaginal" ultrasound.
Ultrasound is also a good way to tell fluid-filled cysts from solid tumors because they make very different echo patterns. It's useful in some situations because it can usually be done quickly and doesn't expose people to radiation. Ultrasound images are not as detailed as those from CT or MRI scans.
Lumps that could be cancer might be found by imaging tests or felt as lumps during a physical exam, but they still must be sampled and looked at under a microscope to find out what they really are. Not all lumps are cancer. In fact, most tumors are not cancer.
A cyst can develop due to a clogged oil gland or hair follicle. Cysts feel like soft blisters when they are close to the skin's surface, but they can feel like hard lumps when they develop deeper beneath the skin. A hard cyst near to the surface of the skin usually contains trapped dead skin cells or proteins.
Bumps that are cancerous are typically large, hard, painless to the touch and appear spontaneously. The mass will grow in size steadily over the weeks and months. Cancerous lumps that can be felt from the outside of your body can appear in the breast, testicle, or neck, but also in the arms and legs.
On ultrasound, they are usually smooth, round and black. Sometimes cysts do not have these typical features and they are difficult to distinguish from solid (non-fluid) lesions just by looking. These may need further testing to confirm they are cysts. Doctors sometimes describe these as “complex cysts”.
Sometimes, it's possible to find cancer before you have symptoms. The American Cancer Society and other health groups recommend cancer-related check-ups and certain tests for people even though they have no symptoms. This helps find certain cancers early.
A sebaceous cyst is possibly cancerous if it has any of these characteristics: A sign of infection such as pain, redness or pus drainage. A fast rate of growth after being removed. A diameter that's larger than five centimeters.
Some cysts are cancerous and early treatment is vital. If left untreated, benign cysts can cause serious complications including: Infection – the cyst fills with bacteria and pus, and becomes an abscess. If the abscess bursts inside the body, there is a risk of blood poisoning (septicaemia).
If cyst removal is needed or wanted, treatment may include injecting a steroid medication directly into the cyst, draining it, or surgically removing it. Steroid injection will help reduce any swelling if the cyst is tender, swollen, or growing. With drainage, the doctor cuts the cyst and pushes out the fluid.
A tumor may feel more like a rock than a grape. A cancerous lump is usually hard, not soft or squishy. And it often has angular, irregular, asymmetrical edges, as opposed to being smooth, Dr. Comander says.
While tumors are fairly stationary, cysts often move and change form when you touch them.
Cancers tend to feel much harder than benign cysts and fibroadenomas. Both benign and malignant masses can be rounded and mobile. Only when cancers are quite advanced are they fixed to skin or the underlying chest wall, and not moveable.