I have 3 small red dots on my left arm any idea what they could be and when they will go away? they dont hurt or anything?

Need to see them. But three in a row suggests bedbug bites. Called breakfast, lunch and dinner. Inspect bed clothes. But on arm.they do not usually bite on arm. Do you sleep on your left arm? If so could be bedbugs. Have local health care person look at them. They will know what they look like and where they are more likely to be in people like you where you live.