I was pointed to this chart for a questions my aunt gave me and I though maybe you can add the link to your post as it has pictures of the disease, just found it to be helpful and you can add it if you want.
i can't get this link to work. can someone else have a go and check it to see if its the link or my computer thats the problem. sounded like a good site and would like to have a look! if its been renamed, does anyone know where its moved to?