it will be best to speak with a medical professional who can help you with that. for the meantime you may wear comfortable clothes that will not irritate the area. <link>
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's been 3 days and it hasn't 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.