
You should always put a clear basecoat on your nails, before apply nail color so your true nails won’t turn color from the harmful chemicals. Did all your nails turn this color? I do not like the dark areas, the yellow will grow out or you can buy toenail fungus polish at a dollar store for a few dollars. Works very well. If the dark areas are not from trauma from hitting your toes and were there, before you polished them with that one color, then go see a dermatologist asap for possible Melanoma skin cancer. This is the most aggressive form of skin cancer!
It looks like you’ve been using dark colors in the past. If you don’t put a base coat on first, it will dye your nails until they grow out. So, it’s probably that. My favorite base coat is Revlon. It’s white and is just awesome!!!