Dear Doctors,

I am a 18 year old male, who plays football four times a week and has experienced two cases of severe systemic allergic reactions from an unknown source only recently (in the past 3 weeks).

The symptoms included redness of skin over the entire body; itchiness; swelling of face and body; and a small drop in blood pressure (however, i have never had any difficulty breathing in both cases). There has been a time lapse between the cases of 3 weeks ( I have been attending regularly football pratice in this time lapse without any complications). I would like to know what factors may induce these recent random outbreaks of systemic allergic reactions?

This has never happened to me before and I have been playing football since the age of 3 in the same area and field. The field is a synthetic turf. There is a nearby forest area as well. I am known to have mild allergies to pollen. There has not been a significant change in my diet recently.

The only solid link I could find that would relate the two cases was on both days it was humid and it had previously rained. I also think i was wearing the same T-shirt on both days.

Thanking you in advance,

Robert.G