dear Richard, hello and welcome to HCM.
this is a difficult question to answer since you have said it is involving on side of face. by the history it seems to be an acute episode. the possibilities include acute angioedema
, which can be localised and the other possibilities are contact allergy
, or a sting. based on the discrition you have given it fits
more into angioedema.pain may be absent here since the tissues around the eye take a lot of fluid since they have lax skin. before arriving at any diagnostic parameter it is essential to treat him for the acute episode. predinisolone and hydroxyzin. can combine with a ice packs to reduce the swelling. also it necessary to get an ophthalmologist to rule out any periorbital cellulitis
. do get his blood pressure cheked and his urine for any protienuria,
it would be difficult to advise without a photogragh but we sincerly try to do our best.
thank ou take care and do contact if necessary.
will wait for your kind reply