 [ Symptoms ] i have a red swollen pimple like area on my stomach that is very sore and is hard ish about 3 inches in diameter it started almost like a pimple i thought it was it is been 3 days and it has not changed it may be getting aggrevated and staying red and hurting due to the fact that when i set up my pants belt underwear etc rub against it [ Disease ] hi the idea of being on bc is to stop you getting pregnant and the thought of using a condom would be to stop stis or stds but they say the first day of your first missed period is the best time do hope this helps you good luck