This morning I noticed what sort of felt like a chapped lip on my bottom lip, which was unusual because I just had rubbed lip balm all over my lips an hour prior. So I went to the bathroom and took a closer look and looked like dry scab on two parts of my lip but are very tiny you have to get tremendously close to even see it. There is no pain or irritation jus feels weird or not normal. Could this be a an oncoming OB ? Also how long does the prodrome stage take to actually turn into fluid filled blisters?? Any help would be greatly appreciated!