Hello! I've always had the problem of a bump suddenly appearing on either my face, chest, or arms rather often (every few days maybe). The bump is usually relatively small, whitish raised area, with a larger red area around it. It's usually very itchy but I have noticed if I don't touch it, the inflammation tends to go down in 1-2 hours. I'm wondering what this could be since I've never been able to find what the trigger for it is.