A 1 cm “boil” on the back is often an infected hair follicle or small skin abscess. The “puncture” may be a small opening or central pus point.

Get same-day medical care if redness is spreading, the skin is hot/swollen, pain is increasing, there is a lot of pus, you feel feverish/chilled, or you have diabetes, immune suppression, or take steroid/chemotherapy medicines. A clinician may need to drain it safely and sometimes prescribe antibiotics.

Go urgently/emergency if you feel very unwell, confused, faint, have rapidly spreading redness/red streaks, or a high fever.

If it is not improving within a few days, enlarges, or remains after 1-2 weeks, arrange a clinic visit. NHS boil advice also advises against picking, squeezing, or piercing boils.

For a 1 cm boil, an antibiotic is often not needed if there is no spreading redness, fever, severe pain, or immune problem. Warm compresses and safe drainage if needed are usually more important than antibiotics.

Do not start an antibiotic on your own. The right choice depends on whether it is a simple boil, surrounding cellulitis, drainage/culture results, allergies, pregnancy status, kidney function, and local MRSA resistance.

If a clinician decides you need one, they commonly choose an oral antibiotic targeting Staphylococcus; options may include cephalexin/flucloxacillin when MRSA is unlikely, or trimethoprim-sulfamethoxazole, doxycycline, or clindamycin when MRSA is a concern. These are not interchangeable and can be unsafe for some people.

Please see a clinician today if it is getting larger, very painful, draining a lot, has redness spreading around it, or you have fever, diabetes, or reduced immunity. They can decide whether it needs drainage, culture, and the correct prescription. The IDSA skin-infection guideline emphasizes drainage as the main treatment for many abscesses.