For the last couple of days, DS (5) has had what we thought was an insect bite near his arm pit, just above his nipple. He seems to be in pain with it and tonight when I picked him up to lift him into bed, he screamed with pain and burst into tears saying it hurt (under his arm pit too). We've looked again and it's spread slightly (1cm long)and looks sore and inflamed. It dosn't seem to be weeping or anything - any ideas as to what it could be? He doesn't really remember doing anything himself that could have caused it. He has a very sore throat, caught from me probably as I've had tonsilitis for the last week. I wondered whether it could be anything to do with glands under the arm???