My little one who is 8 started with a very thin light line on thumb nail & we actually thought its probably maybe his hurt somewhere, but then like after few months it formed into 1 whole line and then after 6 to 7 months its went wider so covers quarter of the thumb nail. Due to coronna could not go doctors but had to send in photos which were then sent to dermatologists, they then called and said dont want to worry you but we would like to investigate it more and do a biopsy and will send a quick 2 week referal. So basically it will be a year by the time they do a biopsy if they send one within the 2 weeks thay have said. I am so worried a si have been googling and seen photos which look like similar photos to melanoma or something. The nail i think does seem weaker from that area as very little chipped off other day.