What could be the cause of a brown band on my nail? (photo)
I've had a brown band on my fingernail for about a year or so. I was diagnosed with PCOS about 5 years ago, and have not followed up with the doctor despite my periods still being irregular.
I am not on any current medication. I did however, do a blood test recently and my T4 and TSH levels came out within the reference range. I am concerned that this may be an endocrinological problem and hence am seeking an opinion on this. Thank you!
Thank you for getting in touch with us. These brown lines are usually the result of pigments being deposited right below where the nail is growing. The medical term is melanonychia.
There can be quite a long list of possible causes for this. But most of the time it is not something dangerous.
You should check it out with your GP or skin specialist.
What we would do is to take a close look at the nail and the skin around it with a "dermascope", or a good magnifying glass to advice you further.