 [ Symptoms ] large red bump leaking puss on the back of the head my boyfriend has a large bumpgrowthbubble on the back of his head near his neck that has been there for almost 2 years when it first appeared he saw a doctor who told him to ignore it if it does not bother him recently it has started to hurt with pain increasing as the time goes by it has become red and come to a head almost like a pimple and is now leaking a whitish fluid kind of like puss [ Disease ] while it is best to keep augmentin refrigerated at all times to maintain efficacy i am uncertain as to whether or not the efficacy was compromised because it was left out of the refrigerator all night it does not become dangerous to use after it has been left out of the refrigerator but it may not work to cure your son is infection and could prolong his illness to be on the safe side i would suggest getting a new prescription without knowing anything else about your son is situation i would say that is the way to ensure he continues to get the most effective form of the medication