Hello. Thank you for writing to us at healthcaremagic It is most likely a bacterial skin infection i.e a furuncle / boil Or an inflammatory acne nodule which has worsened due to squeezing and developed surrounding cellulitis. Pain and swelling suggest that there is pus inside. If I was the treating doctor I would suggest an empirical course of an Oral antibiotic to help resolve the infection. My choice of Oral antibiotics would be either cephalexin or cloxacillin, for a week. Oral antibiotics are prescription products and I suggest you to talk to your doctor for the needful. An OTC topical antibacterial e.g 2% mupirocin ointment, twice daily will also help in resolving the infection faster. An OTC pain killer e.g Ibuprofen once or twice daily can be taken for symptomatic pain relief and swelling. Regards