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A single persistent line on the thumbnail (likely a vertical brown/black line) is usually called longitudinal melanonychia → Longitudinal Melanonychia

It appears like melanonychia , usually a benign condition.if you find any change in appearance, colour,extension., consult a dermatologist in your area

It seems like nail pterygium...just use topic lichensa ointment twice daily

Please check liver function test ( LFT) including serum albumin as hypoalbuminemia can cause this sometimes. Any other nails involved ? Need to rule out fungal infection. Rare for any vitamin deficiency to cause this.

Do consult

A stable vertical line on the nail for months is harmless and not due to vitamin deficiency. It can be due to minor trauma or pigmentation smoking can contribute. No need to worry unless it increases in size, becomes darker, or spreads to surrounding skin.

The thin vertical line on your thumb nail, which has been stable for 8 months without changing in width or color, is most likely a condition called Melanonychia. While vitamin deficiencies (especially B12) can sometimes cause nail discolorations, they usually present more diffusely. Since there is no history of sudden change or 'Hutchinson's sign' (extension of pigment to the nail fold), it is likely benign. However, any pigmented line on a single nail warrants a baseline clinical examination to rule out more serious causes."

Don’t worry, it usually resolves on its own. There are many possible reasons for this, but in your case are you on long-term antibiotics? If yes, that might be one of the causes. Otherwise, it could be due to a vitamin deficiency (especially B12) or possibly related to trauma.

WORRY ABOUT SUCH LINE, SO U R A HAPPY PERS NOTHING ELSE TO WORRY. ASSESSMENT OF VITAMIN D3 B12 T3T4TSH MG. ADVISABLE. IT WILL SELF HEALING  CAPACITY.

Its self resolving. Minor changes may vary person to person. So no worry.

Hi dear, It is melanonychia. It is usually a benign condition usually followed by minor nail bed trauma due to melanin deposition. In your case it looks harmless as it does not reach nailfold/cuticle.

No need to worry

Normal

Kindly do connect and consult

It looks like melancholia, a benign condition caused by increased melanin deposit. It can be caused by trauma, pregnancy,  x ray exposure. However if it increases in size, becomes painful , it needs to be evaluated.

Start Candio

It is like a vitamin deficiency

Usually these lines on the nails appear with iron and calcium deficiencies. If left unattended, the nails can become brittle too. Get your blood tests done for iron studies, haemogram, calcium, alkaline phosphotase, VIT D and review for further management

Multivitamin deficiency

Need a few more details please consult for further evaluation and treatment