I do not have acne. Yesterday numerous small bumps appeared on my chin and are super itchy. They aren't pimples, more of a skin reaction. This is the second time this has happened (both in this year). The first was at work and this time I was at my boyfriend's apartment. I am wondering if this is an allergic reaction to something? Maybe MSG? or Gluetin? It stays for a couple of days and then completely disappears. Not only is it itchy, it's painful and unsightly.