Hello and welcome to HCM, A lump which burst open to release blood and pus is suggestive of a bacterial infection. Herpes simplex infection is characterized by multiple fluid filled bumps which are itchy and painful. The lump described by you is likely to be a boil or folliculitis. Boil is skin infection and folliculitis is inflammation of the hair follicle. A clinical assessment of the lumps is required. If any pus is left behind, drainage of the pus may be required. A course of oral antibiotic may also be required depending on the extent of infection and inflammation. Thanks and take care Dr Shailja Puri