Subungual hematoma is bruising under the nail bed, which can have a bluish-purple color. When you experience trauma to your toe, such as stubbing it or dropping something heavy on it, small blood vessels can bleed underneath the nail. This can result in discoloration.

    According to the American Osteopathic College of Dermatology (AOCD) , you can typically take care of a subungual hematoma with self-care. Treatment options include:

    • over-the-counter (OTC) pain medication
    • elevation
    • ice (to reduce swelling)

    In some cases, your doctor may recommend that they make a small hole in the nail to drain pooled blood and relieve pressure.

    When the temperature gets cold, your blood vessels constrict, making it difficult for enough oxygen-rich blood to reach the skin under your nails. This can cause your nails to appear blue. But it’s actually the skin underneath your nails that’s turning blue.

    Warm foot protection can prevent this from happening to your toes.

    Too little oxygen in the blood or poor circulation can cause a condition called cyanosis . It gives the appearance of a blue color of your skin, including the skin under your nails. The lips, fingers, and toes may appear blue.

    Restricted blood flow can cause discoloration under the nail. Make an appointment with a doctor, especially if you have other symptoms, such as shortness of breath , dizziness , or numbness in the affected area.

    Treatment of cyanosis typically starts with addressing the underlying causes for the restricted blood flow. Your doctor may also recommend medications to relax your blood vessels, such as anti-hypertension medications and antidepressants .

    People experiencing Raynaud’s phenomenon have restricted or interrupted blow flow to the fingers, toes, ears, or nose. This happens when blood vessels in the hands or feet are constricted. Episodes of constriction are called vasospasms .

    Often triggered by cold temperatures or stress, vasospasms can have symptoms that may include numbness in your toes or fingers, and color changes to the skin. Typically, the skin turns white and then blue.

    Raynaud’s phenomenon is often treated with medication to dilate (widen) blood vessels, including:

    • vasodilators, such as nitroglycerin cream, losartan (Cozaar), and fluoxetine (Prozac)
    • calcium channel blockers , such as amlodipine (Norvasc) and nifedipine (Procardia)

    According to BreastCancer.org , you may notice some changes in the color of your nails during treatment for breast cancer. Your nails may look bruised, turning a blue color. They may also appear black, brown, or green.

    Breast cancer medication that can cause nail changes include:

    • daunorubicin (Cerubidine)
    • docetaxel (Taxotere)
    • doxorubicin (Adriamycin)
    • ixabepilone (Ixempra)
    • mitoxantrone (Novantrone)

    A blue spot under your toenail for no obvious reason could be a blue nevus .

    In rare cases, according to the American Osteopathic College of Dermatology (AOCD) , a type of blue mole known as a cellular blue nevus can become a malignant cellular blue nevus (MCBN) and should be biopsied.

    If you have an MCBN, your doctor will most likely recommend surgical removal.

    Although rare, argyria (silver toxicity) is a result of prolonged or high exposure to silver. One of the symptoms of this condition is a bluish-gray staining of the skin.

    Exposure to silver is often traced to:

    • occupational exposure (silver mining, photographic processing, electroplating)
    • colloidal silver dietary supplements
    • medication with silver salts (wound dressing, eye drops, nasal irrigation)
    • dental procedures (silver dental fillings)

    If you’re diagnosed with argyria, your doctor may first recommend ways to avoid further exposure.

    According to a 2015 review article published in the Journal of the European Academy of Dermatology and Venereology, laser treatment may potentially be an effective treatment for argyria.

    For some people with Wilson’s disease (hepatolenticular degeneration), the lunula of the nail can turn blue (azure lunula). The lunula is the white, rounded area at the base of your nails.

    Wilson’s disease is commonly treated with drugs that help remove copper from tissue. These drugs include trientine hydrochloride or D-penicillamine.

    Made up of layers of keratin, your toenails protect the tissues of your toes. Keratin is a hardened protein also found in your skin and hair. A smooth surface and consistent pinkish color usually indicate healthy nails.

    If you have blue toenails and the discoloration is not easily explained, for example by trauma, you could have an underlying condition.

    These conditions may include argyria, cyanosis, Raynaud’s phenomenon, Wilson’s disease, or blue nevus. If you suspect any of these conditions, see a doctor for a full diagnosis and recommended treatment plan.

    Why do big toenails turn blue?
    Too little oxygen in the blood or poor circulation can cause a condition called cyanosis. It gives the appearance of a blue color of your skin, including the skin under your nails. The lips, fingers, and toes may appear blue. Restricted blood flow can cause discoloration under the nail. more
    Can GREY eyes turn blue?
    What color will gray baby eyes turn? At birth your baby's eyes may appear gray or blue due to a lack of pigment. Once exposed to light, the eye color will most likely start to change to blue, green, hazel, or brown over a period of six months to one year. more
    Why do axolotls turn blue?
    Cyanosis (turning blue due to lack of oxygen), blood stasis (congestion) or polycythaemia (thick blood), commonly seen in other terrestrial animals do not occur as dramatically or as commonly in axolotls. more
    Do huskies eyes turn blue?
    Puppy Eye Color All Husky pups are born with blue eyes. They stay blue until the pups are 1-2 months old. Only then you can start to tell which ones will become completely brown and which will stay lighter. more
    Why do wolves eyes turn blue?
    A werecreatures eyes will change from gold to blue after they take an innocent human life. Derek Hale's eyes changed from gold to blue when he gave his girlfriend, Paige a mercy-killing. more
    Why do dogs eyes turn blue?
    Nuclear sclerosis (also known as lenticular sclerosis) is a normal aging change of the lens within the eye. It causes a dogs eyes to have a hazy, blue, cloudy appearance to them. It occurs as the lens fibers in the eye harden, compress and become more visible due to age. more
    Why did my noodles turn blue?
    The discoloration is caused by oxidation of the iron in the dough's egg yolks (store-bought fresh pasta is packaged with nitrogen and carbon dioxide and less than 1 percent oxygen to prevent discoloration) and had only a mild effect on the flavor. more
    How did the sky turn blue?
    The sky is blue due to a phenomenon called Raleigh scattering. This scattering refers to the scattering of electromagnetic radiation (of which light is a form) by particles of a much smaller wavelength. more
    Why do coins turn blue?
    It is primarily the result of oxygen and/or sulfur reacting with the coin's metal. However, the toning process can be accelerated by heat, moisture, and various chemicals in the environment. Some of the most harmful chemicals to coins can be found in cheap coin holders and coin folders. more
    Do eyes turn blue before dying?
    Unlike some newborns, whose eyes are blue due to the amount of melanin present at birth, a deceased individual's eyes will look blue or grayish because of corneal opacity. While the actual color of the iris does not change colors, a hazy film forms over the eyeball which can give it a blue or gray appearance. more
    Why did Godzilla turn blue?
    Godzilla fires his Atomic Breath Godzilla's atomic breath, sometimes called a heat ray or heat beam, is much more powerful than fire and is typically blue in color, and is usually regarded as stronger when red or orange. more

    Source: www.healthline.com

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