Pus formation is an indication of immunity based reactions caused against any infection.
These infections can be air borne, water borne or any other and can occur in any part of the body.
For infection, even a small sore on skin is sufficient to initiate the reaction. So, to avoid such infections and hence pus formations, one should make sure to have clean skin externally.
Always cover the sores where ever possible to avoid infections.
Once pus formation has started, we should consult a doctor for cleaning because it can get spread further.
Doctor may also prescribe oral antibiotics if required.
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