2 of my toenails are black and now the top of my foot is starting to turn black and hurt pretty bad. I haven't had no injuries are nothing.

Hello. Thank you for posting.

A black toenail may be caused by:
An underlying medical condition: This may include anemia, diabetes, heart disease, or kidney disease.
Fungal infections: While these often look white or yellow, fungal infections can sometimes cause black toenails from debris buildup. Your toenails are especially vulnerable to fungal infections because they thrive in moist and warm environments.
Melanoma: This is the most serious type of skin cancer, which often appears as a dark brown misshapen spot. Such spots can also occur underneath nail beds.
Trauma: Usually caused by an injury, trauma to the toenail can cause the blood vessels beneath a nail to break. The resulting bleeding underneath the nail appears black.

If your foot is turning black and is painful you need to see a doctor.

Helena