Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain the symptoms most probably looks like Allery reaction to some unknown allergen causing allergic
Angioedema of lip as well as
sore throat and neck..
As you have given antihistamines or anti allergics but the swelling did not reduce there is a possibility that the allergen is still present which he is exposed to leading to the symptoms of allergy persistently..
You should consult an Allergist and get evaluated and he can do allergic testing and rule out the exact cause of
allergic reaction and preventing exposure to allergen will relieve..
As of now you can be advised to rake Oral and injectable antihistamines and
steroids..
Continue doing cold compresses..
If the symptoms recur after resolution then
Immunotherapy can be give to him to reduce severity of allergy symptoms..
Hope this information helps..
Thanks and regards..
Dr. Honey Nandwani Arora.