Herpes or a pimple. Usually, not always, a tingling soreness type of pain occurs for hours to a day before the herpes virus comes to the surface and forms tiny blisters on a red bump. Pimples usually start red and do not develop blisters. Without treating or manipulating the herpes, the blisters scab. Pimples don't scab on their own unless they're squeezed. Don't touch the herpes to avoid infecting your finger.