To heal blisters on feet overnight, the best approach is to protect the blister and promote a moist healing environment without popping it. Here are key points for fast healing:

• Leave the blister intact as the skin and fluid inside act like a natural bandage, protecting and healing the area. Avoid popping or draining unless the blister is very painful or likely to burst.
• Keep the blister clean and dry initially , then cover it with a special blister plaster or hydrocolloid dressing which keeps the environment moist and speeds healing.
• Use a bandage or blister plaster to protect it from friction and avoid further irritation.
• If popped, do not remove the skin flap , clean with mild soap and water, apply antibiotic ointment, and cover with a sterile bandage.
• Try to minimize walking or pressure on the blister overnight.
• If necessary, for large or painful blisters, a sterile needle can be used to drain fluid carefully while keeping the skin intact to promote faster healing.
• Change dressings as needed and keep the area protected until healed.
• Signs of infection like redness, pus, or increased pain require medical attention.

Following these steps, most blisters can significantly improve or heal within a day to overnight if not aggravated by friction or infection.

Summary:

• Keep blister intact
• Cover with blister plaster or bandage
• Keep clean and dry initially
• Avoid walking or pressure
• Use sterile drainage only if needed
• Watch for infection signs

This method encourages faster and safer healing overnight.