Thank you for uploading the images for my better understanding.
This is called melanonychia as it has been unchanged.
I will explain further please.
Melanonychia is characterised by brown to black discolouration of a finger or toenail.
Melanonychia is most often benign and arises from a mole. However, a band of brown pigment in a single nail must be examined and investigated with caution, as melanonychia may be the presenting sign of melanoma of the nail.
Melanonychia occurs more commonly in dark-skinned individuals. Studies suggest that nearly all Afro-Caribbeans will develop black-brown pigmentation of the nails by the age of 50. It may also be present in up to 20% of Japanese patients.
White-skinned people are less commonly affected.
Melanonychia can present in individuals of all ages, including children, and affects both sexes equally.
The nail is a hard and translucent structure that is not normally pigmented and is made of the skin protein, keratin.
Pigmentation results from the deposition of melanin by the pigment cells, or melanocytes. These typically lie dormant in the nail matrix where the nail originates. As the melanin is continuously deposited in the keratinocytic cells of the growing nail, a longitudinal streak arises. This is termed longitudinal melanonychia.
Will let you know when it requires evaluation:Age >50 years old, the color is brown to black, blurred borders, breadth >3mm, changes in color/ borders/ shape/ elevation/ texture, extension of pigment into nail fold, family or personal history of melanoma.
This is not amenable to treatment with any creams please.
May I suggest you discuss these with your dermatologist please.
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