Psoriasis vs. Skin Cancer: Symptoms and Differences

Medically reviewed by Paul A. Regan, M.D., FAAD

Written by Emily Wagner, M.S.

Updated on September 25, 2026

Feel better informed on psoriasis and get real support from your community.

Join

Key Takeaways

Psoriasis and skin cancer are two different conditions that can sometimes look similar, but knowing the key differences can help you figure out when it is time to see a doctor.
Both psoriasis and skin cancer can appear as patches, bumps, or lesions on the skin, but they tend to show up in different areas of the body and have different characteristics in terms of color, texture, and size. Psoriasis plaques are often itchy, scaly, and symmetrical, while skin cancer lesions may grow or change over time and are more likely to appear on sun-exposed areas.
If you notice any new or changing spots on your skin, sores that do not heal, or patches that affect your daily life, reaching out to a dermatologist is a great next step so they can help figure out what is going on and talk with you about your options.

View all takeaways

Have you ever taken a close look at your skin and noticed a patch or lesion that just doesn’t look quite right? If you’re living with psoriasis, you may be wondering whether you’ve developed a new plaque or if it’s something more serious, like skin cancer.

Psoriasis and skin cancer are two different skin conditions, and psoriasis is not cancer.

The confusion may arise because both can appear as skin bumps, lesions, and rashlike patches. However, key differences can help you decide when to make an appointment with your doctor or dermatologist (skin specialist).

In this article, we’ll cover some tips to help you tell psoriasis and skin cancer apart.

How Does Your Skin Look and Feel?

There are several types of skin cancer. The type, your skin tone, and where it develops can affect how it looks and feels.

Psoriasis has specific characteristics. Although it can affect people differently, healthcare providers tend to look for certain common signs.

Plaque Psoriasis Is Usually Itchier

Plaque psoriasis refers to raised and scaly patches of skin that vary in color. On lighter skin tones, plaques often look red; on darker skin tones, they may look purple, grayish, or dark brown.

The scale on top may appear silvery or white. Plaques may also be itchy and painful.

Basal cell carcinoma (BCC) is a type of skin cancer that affects the basal cells in the top layer of skin. These cells help renew the skin by producing new cells.

Lesions from BCC can look very similar to plaque psoriasis. Some people with BCC develop flat, scaly patches of skin. Others may notice shiny bumps that are pink on lighter skin tones or brown or black on darker skin tones.

Squamous cell carcinoma (SCC) develops in the upper layer of skin, where skin cells are shed to make room for new ones. SCC can also look like plaque psoriasis in some cases. Some people have scaly, rough patches of skin that crust or bleed.

Some BCC lesions can itch.

Psoriasis and Skin Cancer Lesions Can Differ in Size

While psoriasis plaques and skin cancer lesions can look similar, they can also differ in size. Psoriasis can affect large areas of skin. Some people have plaques that cover large areas of their chest or back.

Melanomas can be tiny, but most are larger than the size of a pea. Even small lesions are important to have checked.

For BCCs that are staged, tumor size is one factor used to determine the stage. BCC tumors can vary in size.

Location and Changes Over Time

Which areas are affected and how your skin condition evolves can provide clues about whether you’re dealing with psoriasis or skin cancer.

Psoriasis and Skin Cancer Affect Different Areas of Skin

You can develop psoriasis and skin cancer anywhere on your skin. The type of psoriasis you have will affect where your symptoms develop.

For example, common affected areas for plaque psoriasis include the scalp, elbows, torso, and knees. Plaques are generally symmetrical, meaning they develop in the same areas on both sides of the body. Another type of psoriasis, known as guttate psoriasis, causes the formation of small, round spots on the torso, arms, and legs.

On the other hand, skin cancer tends to develop on areas of skin commonly exposed to the sun. BCC can be found on the head, face, arms, and neck. SCC forms more often on the ears, face, lips, neck, and backs of the hands.

SCC is less common in people with darker skin tones. When it does occur, SCC in people with darker skin tones is more likely to develop in areas that aren’t usually exposed to the sun.

For people with darker skin tones, it’s especially important to check the toenails, feet, lower legs, buttocks, and groin for signs of skin cancer.

Skin Cancer on the Scalp

If you have a full head of hair, you might think your scalp is safe from skin cancer. Although hair can help, it doesn’t fully protect you. About 13 percent of BCCs develop on the scalp, and up to 20 percent of SCCs are on the scalp.

Melanoma on the scalp can be especially dangerous. It can appear as scaly patches, which may be mistaken for psoriasis.

If you or your hairdresser notices any skin changes on your head, be sure to show your dermatologist and ask what they think.

Changing Moles or Growing Lesions May Be Melanoma

Melanoma is a type of skin cancer that affects the melanocytes in the skin. These specialized cells make melanin — the pigment that gives your skin its color. While melanoma is less common than BCC and SCC, it’s the most dangerous type of skin cancer.

Melanomas can have many different appearances. Most people think of moles that have grown and changed over time. However, other signs of melanoma can include:

Small white, pink, red, blue, or blue-black lesions with irregular borders
Large, dark spots on the skin with darker speckles inside them
Dark lesions along your mucous membranes (mouth or nose) or on the palms of your hands or soles of your feet

Psoriasis symptoms may resolve and recur over time. Melanoma can also appear as a new spot without starting in an existing mole. Ask a dermatologist about new or changing skin symptoms.

How Psoriasis and Skin Cancer Are Diagnosed

To figure out what’s causing your skin changes, your dermatologist will ask about your symptoms and examine your skin. If they suspect psoriasis, they may also examine your nails and ask about joint symptoms, because psoriasis can affect the nails and joints.

To help confirm psoriasis, your dermatologist may do a biopsy. They’ll remove a small sample of skin and examine it under a microscope.

A biopsy is also used to diagnose skin cancer. If an area looks suspicious, a dermatologist may recommend a biopsy to confirm whether it is cancer.

When To Have a Skin Change Checked

If you’ve noticed new signs of psoriasis or skin cancer, it’s time to make an appointment with your doctor. They can determine whether the changes are caused by psoriasis, skin cancer, or another condition.

Psoriasis symptoms can be uncomfortable, and the right treatment plan can help. It’s also important to get treatment promptly for skin cancer.

Symptoms that should be checked out include: