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 your question.
With regards to your PCOS. If you're having less than 6 periods a year, I would suggest seeing a doctor about it so that he/she will be able to give you some medicines to shed the womb lining and induce a period.
This is because if you're having very few periods a year, the womb lining becomes very thickened and if left untreated for many years confers a risk of cancer of the uterus. Further management of your PCOS will depend on whether or not you're currently pursuing fertility, and what your concerns are. For example management of acne or unwanted facial hair, management of infertility, management of weight gain etc, all of which are associated with PCOS.
Abnormal thyroid function test can also cause irregular periods. You mentioned having done a thyroid function test and having T4 and TSH within the reference range. If both T4 and TSH are within the reference range then your irregular periods are not thyroid related.
I would suggest seeing an endocrinologist/gynecologist/general practitioner who can evaluate your irregular periods and advise you accordingly.
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.