If you have been around horses for long, you have probably had to deal with an abscess. For farriers, treating abscesses is part and parcel of what we do for a living. An abscess is simply an infection in the sensitive structures of the foot. Often it is from a puncture in the sole that allows bacteria into the solar corium. However, they can occur from a bruise that becomes infected or from the introduction of bacteria from other situations, such as severe wet or environmental changes.