I usually leave cuts and keep a very close eye on them. Bathing with Hibiscrub is a good idea if they are mucky (this is still cheap in tack shops, but gone up in price in chemists). If it's looking like it might need abs then straightforward Amoxycillin is fine. Synulox (Amoxycillin trihydrate/clavulanate) is the mother of all Penicillins to kick ass more severe skin infections I find. Tis epensive though. Do leave that one for when you really need it though.