Is it possible to be allergic to mosquito bites only on certain parts of the body?

Are you allergic to bee venom? Perhaps you were stung?

I am allergic to mosquito bites and some react more than others (usually depending on the type of mosquito I think).

Nope, some bites might react differently but all blood is the same blood in your body; you’ll delevop an allergic reaction anywhere if allergic

I don’t know, but any time something bites me I get large puffy bite marks and they always itch like crazy. I’ve never been stung, but I don’t think those itch.

Maybe you brushed the one off before it could really affect you.

@Marina: I’ve never been stung… and I didn’t even feel this bite until it itched. Bee stings hurt enough that I should’ve noticed it, right?

Maybe it depends on the mosquito?
Who did he stung before he came to annoy you?

By the way, i found out, through experimenting, that putting a little toothpaste on the bite, works wonders.
In three minutes the itch fades away.
Really.

Don’t thank me now, thank me once you tried it and found out that it works.

Perhaps
This looks like a case for Detective Woofles!!

The most likely explanation is that the mosquito that bit you on the back was there longer, and left more saliva (which is the allergen responsible for the reaction). The one that bit your neck may have left less saliva, leading to a milder reaction.

Alternatively (as you suspect), you were bitten by two different insects, with two different types of saliva leading to two different reactions.