instruction: hello doctor I have a dark line in my toenail for a long time since I was a kid I realize that but never came into my mind that could be dangerous the same happened to my fingernail many years after I became an adult I would like to know if it is something serious and should I care about it
output: hi welcome you to icliniq com I have seen your query and examined your given picture it seems you have developed melanonychia the cause of this are many such as inflammatory nail diseases like lichen plans racial nexus in nailed and rarely melanoma you need to go for nail biopsy for confirmation