I’ve been experiencing an itchy crawling sensation on my body, is it caffeine?

I’ve been experiencing an itchy crawling sensation on my body recently with no rash or bites or anything. I’ve had this before about 2-3 weeks ago and sometime before that too and it seems to gradually disappear and then return again. I get the itching on my face, scalp, arms and legs. I did go to my doctor and she said it must be an allergy because there’s no sign of anything on my body. Did think it may be caffeine as i previously started to drink it a lot more often, so have took that out my diet but still not sure that is the issue.