Hi thanks for your question.
Since the accident is 3 week old there is nothing to worry. The bump which your having on your temple post trauma is haematoma
,that is collection of blood under muscle and skin.Haematoma is medical term used for this condition and yes this happens after accidents.Haematoma usually get resolved of itself in due course of time and don't need any active treatment. The only danger associated with haematoma is infecion,which if occurs can lead to puss formation, Since you must be taking antibiotics for pneumonia
, so this there is nothing to worry, as antibiotics will also prevent haematoma from getting infected. The pressure and discomfort is due to haematoma and you can take pain killers for discomfort.
Hope this answers your question.