Hello. Thank you for writing to us at healthcaremagic The lump is most like due to bacterial infection of the skin and soft tissue and it seems like a furuncle/boil to me, the infection usually gaining entry through the hair follicle. If I was the treating doctor I would have asked you to take a week of an oral antibiotics. My choice of oral antibacterial would have been either flucloxacillin or cephalexin. An OTC oral anti-inflammatory e.g ibuprofen,twice or thrice daily will provide you symptomatic relief from pain and swelling. Topically you may use an OTC topical antibacterial e.g 2% mupirocin ointment,. twice daily. Regards