there is really no way for me to blindly offer you a response. if i can't see it exam you etc. it would be impossible for me or any medical professional to be able to offer you a definitive answer. you will need to see a medical professional if this spot does not resolve. there can be dozens and dozens of possibilities as to the cause. an insect/spider bite contact dermatitis etc.
what are multiple red dots on my leg that itch. i just got out of the shower and had a spot (about four inches) with little red dots that itched