In other countries, doctors also use MEBO Wound Ointment to treat cracked nipples, shingles, fissures, chilblains, impetigo (school sores), haemorrhoids, cracked/chafed/grazed skin, and donor-site repair. How to use MEBO Wound Ointment. Minor skin wound: Apply up to 1 mm thickness of ointment over the burn as quickly as possible.