Reviewed By:
Yukiko Ueda, MD (Dermatology)
Dr. Ueda graduated from the Niigata University School of Medicine and trained at the University of Tokyo Medical School. She is currently a clinical assistant professor at the Department of Dermatology, Jichi Medical University, and holds several posts in the dermatology departments at Kyoto Prefectural University of Medicine, Komagome Hospital, University of Tokyo, and the Medical Center of Japan Red Cross Society.
Please choose the symptom you are most concerned about.
It will help us optimise further questions for you.
By starting the symptom checker, you agree to the Privacy Policy and Terms of Use
Find another symptom
How Ubie can help you
With an easy 3-min questionnaire, Ubie's AI-powered system will generate a free report on possible causes.
Your symptoms
Our AI
Your report
Personalized Report
✔︎  When to see a doctor
✔︎  What causes your symptoms
✔︎  Treatment information etc.
There is blackened skin on the base of the foot
There is darkened skin on the sole of the foot
There is darkened skin on the back of the hand
There is blackened skin on the epigastric area
Just 3 minutes.
Developed by doctors.
Learn More
Content updated on Jan 4, 2023
Dark spots on the skin, or hyperpigmentation, occur when some areas of the skin produce more melanin than usual. Melanin gives the eyes, skin, and hair their color.
Seek professional care if you experience any of the following symptoms
Facial edema
Edema
Infertility
Abnormal menstruation
Headache
Unexplained weight loss of 5% or more in 1 month
Recent weight loss
Easy fatiguability
Allergic rashes. Risk factors include genetics, other allergic disease, new skin products, and allergic foods. Cases of childhood eczema can resolve by adulthood, however in some cases it can happen to adults too.
A disease where blood sugar levels are abnormally high, due to problems with insulin production or resistance. There are often no symptoms until the condition has worsened, hence regular screening is important.
A skin condition characterized by dark patches on the skin with a thick, velvety texture, usually seen in the neck, armpits or groin region. It's usually seen in people with high insulin levels, ovarian cysts, thyroid or adrenal glands problems, certain drugs like birth control pills or steroids, cancer etc.
Venous embolism is the condition where a venous clot travels from one location to another. Most commonly this happens when a deep venous thrombosis (clot) develops in the larger veins of the leg and breaks off and travels to the lungs (clot is now called a pulmonary embolism). Causes of venous thrombosis include recent surgical procedure, spinal cord injury or other reason for immobility, fracture of hip or leg or other trauma, cancers, heart failure, stroke, obesity, and inherited risk factors like gene mutations causing blood to clot more easily.
Your doctor may ask these questions to check for this symptom
Do you have skin darkening?
Do you have itchy skin?
Do you have any pain or tingling in the affected areas of the skin?
Do you have skin redness?
Do you have a fever?
Other Related Symptoms
Reviewed By:
Yukiko Ueda, MD (Dermatology)
Dr. Ueda graduated from the Niigata University School of Medicine and trained at the University of Tokyo Medical School. She is currently a clinical assistant professor at the Department of Dermatology, Jichi Medical University, and holds several posts in the dermatology departments at Kyoto Prefectural University of Medicine, Komagome Hospital, University of Tokyo, and the Medical Center of Japan Red Cross Society.
Just 3 minutes.
Developed by doctors.
Ubie is supervised by 50+ medical experts worldwide
Seiji Kanazawa, MD, PHD
Obstetrics and gynecology (OBGYN)
National Center for Child Health and Development, Japan