Coming back from a two days vacation I 've noticed a swollen spot on his (Four years old, male) nose. It was as if he was bitten by Something !. When we arrived at home I have tried to take out if there were any thing. Hairs came in my hand without any extra effort and the swollen reddish skin became apparent. In three days, though swollen -not any more- a crut was formed and a second spot, smaller in size, was formed. Today it is the third one 2cm back of his right eye !

Can it be:
Any sort of infection, emotional disturbance, allergic reaction to accidentally digested material?

Any suggestions?

Please !