My husband has severe pain and redness on his foot. what do i do?

Possible infection: Pain and redness indicate likely infection unless he was injured. Infection requires antibiotic treatment promptly. So take him to see a doctor right away and seek medical consultation for treatment of his infection. Also check his temperature as most often infection is accompanies by fever. Good luck.

Agree with Dr. L: If your husband has diabetes, you should treat it as an emergency. Wish you and your husband good health!