I hope you had fun.
What part of Mexico did you travel to? Which state (estado)? What did you do?
I've had problems with mosquito bites too...the last two times I went to Hawaii. This last time (August) was the first time I was on the biologics...but my goodness, the bites made me look like I had some sort of pox...big, red, and even bruised around the edges....all larger than a 50 cent piece...and sore too...took nearly 2 weeks to get rid of them...
I've gotten bit here, but maybe (just my own hypothesis), since I'm not exposed to these skeeters as often...my body doesn't like the things in their (the skeeters) mouthpieces...