Conversation: The conversation between human and AI assistant.
[|Human|] I have a darK line that recently appeared on the side of my toe beginning at the base of the nail and running along side the nail to the top of the nail (not the toe). Could a melanoma appear that quickly? I am constantly stubbing my feet against the base of a love seat as I do not wear shoes in the house. The line almost looks like I could remove it. There does not seem to be any pain. I am concerned about cancer . Please offer some guidance.
[|AI|]  Hi!welcome to Chat Doctor! Lines and other deformities or color changes are common, and most of them are not serious. This is particularly true if the line runs vertically, as in YOUR case. Fungal infections of the nail will cause similar lines, although typically there is also more generalized deformity or thickening of the nail as well. Another possibility would be a foreign body under the fingernail, which can look like a black line. . Finally, rarely, bleeding can show up under the nails as small dark lines called splinter hemorrhages AND since you are constantly stubbing it under chair so sublingual hemorrhage can be a possibility. Melanomas occur on nailed but in your case its is not likely because it hardly presents like a straight vertical line. You must visit a doctor especially to rule out any fungal infection or trauma. Isincerely hope this will help you!take care!