Erythromycin ointment can be used for paronychia. Paronychia is a disease where an infection occurs in the nail groove or the surrounding soft tissue. If left untreated, paronychia can develop into more severe conditions such as subungual abscess. Paronychia often results from injuries such as abrasions, puncture wounds, ingrown nails, or pulling out hangnails. Erythromycin ointment can be used as a topical medication for paronychia, but it is important to keep the affected area clean and dry.