the lower right corner edge of my lip has what seems to be a pimple. It appeared randomly, when i press my tongue against it, it feels like a hard ball, and it hurts when i do that, and when i look in the mirror and do that, its looks white.... like pus perhaps ? i put hydrogen peroxide on it and it bubbled. and i used the terminator acne cream on it. i have had since monday. What else can i do to get rid of it ? ... and can this be a fever blister ? i really hope not . i havent had one of those. i am also on my period can this be a cause of it ? .