i think it's best if u post a pic of the damage. that would help many help u... dun use any med until u're sure of wat sort of damage it is. i agree that meds are a last resort... often good water conditions are sufficient for healing. i'm one of those who loves to keep nature as 'additive' free as possible... even if they say the med is 100% natural, i'd rather see nature fight for itself! it's amazing to watch them heal naturally sometimes. bettas are tough despite their small size... trust me... their natives here in malaysia and in thailand where i work... i grew up knowing they can take a couple of knocks at the very least.