Our expert says:
If it sits fairly superficial it usually is an infection in one of the sweat glands. Put heat on ( warm face cloth) and bactroban ointment, don't use any deoderant. Sometimes it makes an abcess that needs to be drained - if you feel the centre going soft, rather see your doctor.
A deep nodule may be a lymphgland and for that you must see your doctor asap.
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