Repeatedly placing objects beneath the nail to clean it can worsen the separation.
Once the nail has lifted, the space underneath may collect moisture and debris, increasing the possibility of secondary infection.
When Should You Seek Medical Advice?
A small area of separation after an obvious injury may improve as the nail grows.
However, persistent separation, pain, discoloration, or involvement of several nails deserves assessment.
Treatment depends on the underlying cause.
Keeping the nail short and dry and avoiding further trauma can help prevent worsening.
14. Green Nails: A Possible Sign of Bacterial Colonization
A greenish nail discoloration may be associated with a bacterium called Pseudomonas aeruginosa.
This condition is sometimes called green nail syndrome.
It can develop when moisture becomes trapped between the nail plate and nail bed, particularly when the nail has already separated.
The bacteria produce pigments that can create a green, blue-green, or greenish-black appearance.
Risk factors include:
- Frequent exposure to water.
- Onycholysis.
- Artificial nails.
- Nail trauma.
- Chronic irritation around the nail.
Green discoloration should not automatically be treated as a fungal infection.
A healthcare professional may examine the nail and recommend appropriate treatment.
Keeping the affected area clean and dry and avoiding further nail damage are useful preventive measures.
15. Dark or Red Nails After Injury: When Is It Just a Bruise?
A nail that becomes dark red, purple, or black after an injury may have developed a subungual hematoma.
This is a collection of blood beneath the nail plate.
It can occur after a finger is trapped in a door, struck by a heavy object, or injured during sports.
Symptoms may include:
- Dark discoloration.
- Throbbing pain.
- Pressure beneath the nail.
- Tenderness when touching the fingertip.
Small hematomas may grow out naturally as the nail advances.
Larger injuries can be very painful and may involve a fracture of the fingertip bone.
When Should You Seek Medical Care?
Medical assessment is appropriate when:
- Pain is severe.
- The injury was significant.
- The nail is split or partially detached.
- The fingertip is deformed.
- There is numbness.
- There is an open wound.
- The dark area does not move outward as the nail grows.
Do not attempt to drill or puncture the nail at home to release trapped blood.
A clinician can determine whether drainage or imaging is necessary.
A dark area that develops without a known injury should also be assessed, particularly if it changes over time.
16. Nail Changes and Nutritional Deficiencies
Healthy nail growth requires adequate nutrition.
The body needs protein, vitamins, minerals, and energy to produce normal nail tissue.
However, it is important not to assume that every nail abnormality is caused by a nutritional deficiency.
Many nail changes have non-nutritional explanations.
Iron
Iron is needed for hemoglobin production and normal oxygen transport.
Iron deficiency may be associated with brittle nails and, in more severe cases, spoon-shaped nails.
People with fatigue, pale skin, or shortness of breath may need blood tests to evaluate iron status.
Protein
Nails are largely made of keratin, a protein.
Severe protein deficiency or significant malnutrition may affect nail growth and overall tissue health.
However, ordinary nail splitting does not automatically indicate inadequate protein intake.
Zinc
Zinc is involved in cell growth, tissue repair, and immune function.
Severe zinc deficiency can cause changes in the skin, hair, and nails.
However, zinc supplements are not a proven solution for every nail problem.
Vitamin B12
Vitamin B12 is important for red blood cell formation and nervous system function.
Deficiency may cause anemia and neurological symptoms.
Some people develop nail discoloration, but nail appearance alone cannot reliably identify B12 deficiency.
Biotin
Biotin is a B vitamin involved in several metabolic processes.
Small studies suggest that biotin supplements may improve nail strength in some people with brittle nails, but the evidence is limited.
Biotin deficiency is uncommon in otherwise healthy people.
High-dose biotin supplements can interfere with certain laboratory tests, including some tests used to evaluate thyroid function and heart-related conditions.
People should tell their healthcare professionals if they take biotin supplements before undergoing blood testing.
Should Everyone Take Nail Supplements?
No.
A balanced diet is generally the best starting point.
Supplements are most useful when a specific deficiency or increased nutritional requirement has been identified.
Taking excessive amounts of certain vitamins and minerals can cause harm.
For example, excessive selenium can contribute to hair and nail problems, while excessive vitamin A can cause toxicity.
17. Nail Changes Associated With Diabetes
Diabetes can affect blood vessels, nerves, and immune function.
These changes may influence the health of the hands and feet.
People with diabetes may be more susceptible to certain infections, including fungal nail infections.
They may also experience slower healing when the surrounding skin is damaged.
Possible nail-related problems include:
- Fungal nail infection.
- Thickened or brittle nails.
- Nail discoloration.
- Recurrent infections around the nail.
- Skin inflammation.
