I am 18 and have been ill all this week and ive noticed in the mirror today my legs have darkened slightly and my veins in my thighs are really dark and showing more than usual, Also i have a few bruises that have come from nowhere... my legs feel weak achy and i find it difficult and weird to walk, im quite worried because my mum told me unknown bruising could be a sign of cancer and she wants me to go to the doctors but i dont know if im over reacting?? any thoughts please???