Every time I get a sore throat, the skin on my chin and neck itches. Why?

I was looking for ways to relieve the itching when I found out that it isn't really normal. My neck has always itched intolerably only when I have a sore throat since I was a child. I have always had asthma, but on no other occasion has my neck EVER itched. There is never any rash or discoloration, only redness from scratching all the time. My skin isn't dry and I've never itched anywhere else. Does anyone else have this problem? The only thing I can do to relieve the itch is to tie a warm towel around my neck. What could be the cause of my skin itching on the outside from a sore throat deep inside my body?