Moles - Symptoms and causes - Mayo Clinic
2023年12月15日 · Moles, also known as nevi, are a common type of skin growth. They often appear as small, dark brown spots that are caused by clusters of pigment-forming cells called melanocytes. Most people have 10 to 45 moles that appear …
Melanoma pictures to help identify skin cancer - Mayo Clinic
2023年12月16日 · Asymmetrical skin growths, in which one part is not like the other, might be melanoma. Here, the left side of the mole is dark and slightly raised. The right side is lighter in color and flat.
Melanoma - Symptoms and causes - Mayo Clinic
2023年12月30日 · Typical moles have a distinct border separating the mole from the surrounding skin. They're oval or round and usually smaller than 1/4 inch (about 6 millimeters) in diameter. Most moles begin appearing in childhood and new moles may form until about age 40.
Seborrheic keratosis - Symptoms & causes - Mayo Clinic
2022年1月18日 · A seborrheic keratosis (seb-o-REE-ik ker-uh-TOE-sis) is a common noncancerous (benign) skin growth. People tend to get more of them as they get older. Seborrheic keratoses are usually brown, black or light tan. The growths (lesions) look waxy or scaly and slightly raised. They appear gradually, usually on the face, neck, chest or back.
Skin cancer - Symptoms and causes - Mayo Clinic
2022年12月6日 · People who have many moles or abnormal moles called dysplastic nevi are at increased risk of skin cancer. These abnormal moles — which look irregular and are generally larger than normal moles — are more likely than others to become cancerous.
Moles - Diagnosis and treatment - Mayo Clinic
2023年12月15日 · Moles, also known as nevi, are a common type of skin growth that vary in color, shape and size. While most moles are most often harmless, they rarely can become cancerous.
Actinic keratosis - Symptoms & causes - Mayo Clinic
2022年12月17日 · Examine your skin regularly, looking for the development of new skin growths or changes in existing moles, freckles, bumps and birthmarks. With the help of mirrors, check your face, neck, ears and scalp.
Age spots (liver spots) - Symptoms & causes - Mayo Clinic
2022年2月11日 · Age spots don't require medical care. Have your doctor look at spots that are black or have changed in appearance. These changes can be signs of melanoma, a serious form of skin cancer. It's best to have any new skin changes evaluated by a doctor, especially if a spot: Is black; Is increasing in size; Has an irregular border
Basal cell carcinoma - Symptoms & causes - Mayo Clinic
2021年10月1日 · Basal cell carcinoma is a type of skin cancer that most often develops on areas of skin exposed to the sun, such as the face. On brown and Black skin, basal cell carcinoma often looks like a bump that's brown or glossy black and has a rolled border.
Mayo Clinic Q and A: Bleeding moles and skin checks
2021年7月2日 · Most moles are harmless, but it's possible for melanoma — a rare but serious skin cancer — to develop in or near a mole. Although it may not be serious, a mole that bleeds is a possible sign of melanoma.