Had a black mark in the bottom corner but of my big toenail. First noticed it about a month ago and it's been spreading upwards (but not across) the nail. Assumed it was bruise or just part of the fungal nail infection I've had in that toe. Went to podiatrist 5 days ago to make sure it was okay and she said it looked like a hematoma to her but to keep a watch to make sure fresh nail grows underneath. Felt reassured but sent a photo to my GP to be on the safe side. Got a phone call the next day to say he was referring me to a dermatologist as it might be a melanoma as it looked "a bit irregular". After my initial panic I calmed down somewhat and had another look to see if I could see under the cuticle any fresh nail but all I did was make it bleed from the surface of the nail near the cuticle which only made me panic again as the doctor had said to look out for any bleeding. If anyone has any experience with this and can offer any reassurance it would be much appreciated.