I wore clothes that had a black colored stains for 2 days what should i do now? can it be black mold?

I wouldn't loose sleep over this. Few dark molds are toxic to begin with. If it were a toxic mold, skin contact would not by itself cause a problem. Living in an environment breathing black mold spores would.

could be black mold or what we can skid marks from old stool Need pictures. Either should not be a problem but I would wash them before wearing again.

Even if the black spot were black mold, it is not a cause for concern. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV, Flu and Covid vaccines. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex