u/Statinko

To keep it short and not to take your time.
The day before I ran 20 km.
After about 3 miles I felt my right foot was on fire.
Ive walked 10-20 meters to let it relax a bit, every so 4 miles.
Once I was done I took my sock of and saw my toenail all purple. It didn’t hurt while I was running and it doesn’t really hurt when i walk barefoot. But once I put my running shoes again I feel discomfort.
If anyone has the same problem or knows how I’ve done it. Please let me know. And tell me what I should to next.
Thank you