Hi welcome to Health care magic forum.
Thanks for asking a question to H.C.M.Forum.
Dermatographism is itchy bulges on the skin due to pressure on the skin of cloths scratches etc due to allergy
. Of course the problem in the throat is also can be due to allergy, or infection. The difficulty in swallowing could be due to G.E.R.D. due to gastric irritation .
I advise you to consult a gastro enterologist for diagnosis and treatment of G.E.R.D.
wishing for a quick and complete recovery.