The principal function of a band-aid is to keep a cut, scrape or scratch clean while it heals. Band-aids also absorb blood and other fluids. Bandages are easy to make and in a pinch, any kind of tape works, although for the long term, medical adhesive tapes work best. Sterile gauze pads work best, but in their absence, any clean, light cloth will do the job, until better access is available to products specifically designed for healing wounds.
Find something for the gauze. White, cotton fabric works best, because it contains no dyes that can bleed into a wound. Cut the fabric slightly larger than the wound.
Heat the temporary gauze with an iron, drop it in boiling water for a few minutes, or apply antibacterial hand sanitizer to the pad.
Place the fabric over the wound.
Unroll tape pieces to hold the pad in place and cut them longer than the gauze.
Tape the pad on each side to keep dirt out and hold the bandage in place. If you do not have any tape, use strips of fabric to tie the gauze to the wound.
Change the bandage at least once a day to reduce the risk of infection.
Do not use fabrics that have high levels of lint. As the skin heals, the skin can grow into the lint, making it harder for the wound to heal.