So I woke up really itchy 2 nights ago and found what looked like mosquito bites on my elbows and hip. The ones on my elbows were annoying for a day but don't itch and arnt swollen anymore just a little warm to the touch but the one on my hip hurts me and is red and swollen (I havnt been scratching it) I was trying to ignore it but when I took my shirt off my husband saw it and pointed out how red and swollen it is. he thinks it's a spider bite. opinions? when should I be concerned.