How should i treat a really bad burn that has busted open?

Superfast healing: The real question is what not to do that slows down healing. Avoid using alcohol, peroxide, hibiclens, betadine, and bleach solutions. Inflammation ( red, hot, swollen, tender) is important to healing so anti-inflammatories (motrin, advil) are bad. Cover the area with a clean dressing changed every other day and protected from trauma. Antibiotics do not help healing unless it is truly infected.

Keep clean. See doc.: You don't give a time course for how long it's been since you were burned or the depth of the burn. 2nd-degree (i.e., partial-thickness) burns will heal in 1-3 weeks. 3rd-degree (i.e., full-thickness) burns will usually require skin grafting to fully heal. If your burn wound does not fully heal, a burn, plastic, or general surgeon should evaluate the wound.