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What is the brown vertical streak in my thumbnail?

This Premium Q&A, reviewed and published, features a real conversation between an iCliniq user and a physician.

Patient's Query

Hi doctor,

I have noticed this very pale light brown vertical streak in my thumbnail about a week ago. I am very worried after reading online about something called longitudinal melanoma. I am 27 years old female.

Thank you.

Answered by Dr. Shanza Ikram

Education:

FCPS

Professional Bio:

Dr. Shanza Ikram is a highly experienced Dermatologist specializing in the diagnosis and treatment of skin, hair, and nail disorders. She is skilled in both medical and cosmetic dermatology, offering advanced treatments for conditions like acne, eczema, pigmentation, and aging concerns. With her patient-focused approach, Dr. Ikram provides personalized care to promote healthy and radiant skin.

This doctor is not available for online consultations on the platform anymore.

Hi,

Welcome to icliniq.com.

I have gone through your case. Well, longitudinal melanoma is one of the causes of brown streaks. Other causes include multivitamin deficiency including zinc. These are micronutrient and not stored in the body and need a continuous replacement. Other causes include normal variation. Drugs like Doxycycline and many others can cause it, and lichen planus too. To rule out lichen planus, I need to see your all 20 nails and buccal mucosa.

It is longitudinal melanonychia. Melanoma is a malignancy and it does not look to be the cause in your case. Take capsule Perfectil plus (multivitamins) for three months. In my clinical opinion, this is a normal variation (attachment removed to protect patient identity). Melanoma is dark and irregular in appearance. Just stay relaxed. Nothing to worry about this.

I hope this helps.

Thank you.

Medically reviewed by iCliniq medical review team
Published At July 26, 2018
Reviewed At June 12, 2026

Education:

FCPS

Professional Bio:

Dr. Shanza Ikram is a highly experienced Dermatologist specializing in the diagnosis and treatment of skin, hair, and nail disorders. She is skilled in both medical and cosmetic dermatology, offering advanced treatments for conditions like acne, eczema, pigmentation, and aging concerns. With her patient-focused approach, Dr. Ikram provides personalized care to promote healthy and radiant skin.

This doctor is not available for online consultations on the platform anymore.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Education:

FCPS

Professional Bio:

Dr. Shanza Ikram is a highly experienced Dermatologist specializing in the diagnosis and treatment of skin, hair, and nail disorders. She is skilled in both medical and cosmetic dermatology, offering advanced treatments for conditions like acne, eczema, pigmentation, and aging concerns. With her patient-focused approach, Dr. Ikram provides personalized care to promote healthy and radiant skin.

This doctor is not available for online consultations on the platform anymore.

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