dear user brief answer is it could be spinal leakage if the site closer to vertebral column or suggested bacterial infection causing local abscess thse symptoms of lump oozing clear drainage should be clically examined and may require other investigations as local wound culture and pripheral blood culture may be needed... if any injury had been in the past few days of this area skin may cause bacterial invasion and formation of pus then drainage occur ....if the care provider doesnot wash hands and wear clean gloves and cleanse your hand and apply alcohol it will be risky to increase the bacterial infection if your husband get feverish you should do pripheral blood culture and drainge examination to detect micro organism that causes that till now the infection is localised and only topical antibiotic cream will be helpful simple investigations as x ray , mri ,blood culture will help alot to declare diagnosis wish you healthy life