Hello I appreciate your concern Looking at your description, this could be infected sebaceous cysts, perianal gland or allergic rashes I would like further information to help you better like Your age and medical history like presence of any metabolic disease as diabetes or thyroid disease If you can upload me a photograph of the swelling? Acne on the face generally appear near adolescent age due to blockage on duct draining the secretion of skin glands You can apply antiseptic or antibacterial ointment like clindamycin or mupirocin to prevent superinfection. Maintain good hygiene Have lots of fresh fruits and fluids. Hope this answers your question Thanks and regards