What is Melanonychia?

Melanonychia is a black or brown pigmentation of the normal nail plate, and may be present as a normal finding on many digits in black patients, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption.

There are two types, longitudinal and transverse melanonychia. Longitudinal melanonychia may be a sign of subungual melanoma (Acral lentiginous melanoma), although there are other diagnoses such as chronic paronychia, onychomycosis, subungual hematoma, pyogenic granuloma, glomus tumour, subungual verruca, mucous cyst, subungual fibroma, keratoacanthoma, carcinoma of the nail bed, and subungual exostosis.

Questions and answers on "Melanonychia"

I have a thin black line in my right thumbnail. And a slight dent in the middle of my nail where the black line is. Should i be concerned...

doctor1 MD

Brief Answer:
Longitudinal melanonychia and its causes

Detailed Answer:
Thanks for being at HealthcareMagic
I have reviewed the attached...

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if i have a dark line on my thumb nail do have Syphilis i have no other signs and have not been active over 6...

doctor1 MD

Brief Answer:
not syphilis

Detailed Answer:
Thanks for the query.
Just relax a single dark line on nail is not significant.
It is not a sign...

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Hello Doc,

I am XXXXXXX An XXXXXXX a vegetatrian (recently started eating egg). I am living in Japan.

After coming to Japan an year ago. I feeI, I...

doctor1 MD

Brief Answer:
Regarding your concerns related to nail and skin

Detailed Answer:
Hello. Thank you for writing to us

I am Dr..Kakkar (Dermatologist...

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