I have red skin under my breasts, it's red and smells like pus... I tried diaper rash cream and Weber ointment, but with no results.

If you have had these symptoms for more than a week and the redness is spreading, it is highly recommended that you consult a doctor. Consider trying an antibiotic treatment like Polysporin or Bactroban, which can be found over the counter at pharmacies. It may be helpful in resolving the issue.