Few months back I was cutting my son's toenails and noticed a black line down his toenail. Impossible to get a GP appointment so I took him to the pharmacy to see if they could treat it. Pharmacist said , absolutely not, this boy needs seen by a doctor. Cut to, I took him to the GP as he had became really tired too. GP then made an urgent referral to paediatrics but ensured me that it was more than likely an injury but insisted on having bloods done. Bloods taken, absolutely fine. Now because the bloods were fine his urgent referral to paediatrics has now become a routine appointment with the waiting list being over a year. Now my concern is that the line continues to grow when I cut his nails. There is no bruising , no redness ect just this black line. Does anybody know what could be causing this?