I recently bought new shoes (leather) and wore them yesterday for the first time and today. I just spotted some dark brown stains at the toecaps of both shoes and I am sure that those weren't there when I bought them.
I have no idea what could have caused those stains. I was mostly inside at the workplace, so I don't think that this comes from mud or dirt.
Do you have an idea what it might be and how I can get rid of it without damaging the material?