iCliniq logo

Ask a Doctor Online Now

HomeAnswersDermatologymelanonychiaI noticed two brown lines on my thumb which are painful. Why so?

What do two brown lines on the thumb region suggest?

The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Answered by

Dr. Suvash Sahu

Medically reviewed by

iCliniq medical review team

Published At December 7, 2022
Reviewed AtDecember 7, 2022

Patient's Query

Hello doctor,

I noticed two light brown lines on my left thumb that are sometimes painful. I am scared if it is anything serious.

Please help.

Answered by Dr. Suvash Sahu


Welcome to icliniq.com.

I went through your query and understood your concern.

According to your description and the picture shared (the attachment was removed to protect the patient's identity), you have longitudinal melanonychia or linear pigmented lines. The presence of linear pigmented lines on the nails can be due to multiple causes. In white people, the presence of these pigmented lines is considered abnormal and requires thorough assessment, including biopsy. In dark-skinned people, it is a common variant. The most common cause of these lines is a racial factor. Other causes include intake of drugs, trauma, lichen planus, subungual nevi, and malignant melanoma.

Do not worry about it, but do watch the pigmentation. If you notice any variation within the pigmented line or pigmentation on the adjacent nail fold or finger pulp, consult a dermatologist for further evaluation.

I hope this has helped you.

Thanks and regards.

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

Dr. Suvash Sahu
Dr. Suvash Sahu


Community Banner Mobile
By subscribing, I agree to iCliniq's Terms & Privacy Policy.

Read answers about:


Ask your health query to a doctor online


*guaranteed answer within 4 hours

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.

This website uses cookies to ensure you get the best experience on our website. iCliniq privacy policy