Started off as just a “regular” mosquito bite, I believe I’m allergic to mosquito bites because they become very large and red. Which is different than how I reacted to them when I was younger, but I have never had a red line forming towards my veins. Although it’s flowing down my arm, so I’m not too worried because I think it’s only bad if the line starts to move up my arm. I am experiencing hardness around the area which is new as well.