U.S. doctors online nowAsk doctors free
A female asked about a male:

What causes black lines in the toenails?

3 doctor answers4 doctors weighed in
Dr. Jeffrey Kass
Podiatry 29 years experience
Sometimes this: Is a normal variant, sometimes it could be blood that is dried, melanoma at times needs to be ruled out.
Dr. HECTOR Franco
Dermatology 47 years experience
Various things: In people with skin of color it may be a normal variation. Skin growths may also cause them, both of the benign and malignant kind. See your dermatologist.
Dr. Heidi Fowler
Psychiatry 26 years experience
Different causes: Black stripes down 1 nail may be subungual hematoma. Red or brown streaks may be splinter hemorrhages. Brown/black lines from nail plate to tip are often seen in people with dark skin & are normal. Subungual Melanoma can cause nail ridges & dark colors of cuticle. It most often effects the thumbs or big toes. Dark lines may be due to other illnesses. Get checked out when in doubt.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

Similar questions

A 41-year-old female asked:

I have black lines on my toenail is it something I should be worried?

4 doctor answers5 doctors weighed in
Dr. Brian Wagner
Podiatry 19 years experience
Black lines: This could be caused by your skin color with melanin within the nail root. If there is one line or so and your light skinned i would have it looked at.
A 26-year-old male asked:

What cause faint lines on toenails?

2 doctor answers3 doctors weighed in
Dr. Glenn Aufseeser
Podiatry 10 years experience
Nail lines: Changes in nails can result from trauma, fungus, and systemic conditions such as psoriasis. I would recommend evaluation by a podiatrist or dermatologist if you are concerned.
Daytona Beach, FL
A 44-year-old female asked about a 52-year-old female:

What causes lines, ridges & bumps in fingernails & toenails?

1 doctor answer2 doctors weighed in
Dr. David Hettinger
Podiatry 37 years experience
Could be MANY things: Reasons range from prior serious illness, psoriasis, trauma, metabolic disease, infection, etc. It's tough to tell without more details and an exam.

Related questions

A 50-year-old member asked:
1 doctor answer3 doctors weighed in
A 19-year-old member asked:
2 doctor answers9 doctors weighed in
A 58-year-old female asked:
1 doctor answer1 doctor weighed in
Last updated Nov 1, 2018
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $39!
50% off with $15/month membership


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.