Hi welcome to Health care magic forum. It appears that you have less resistance to tacle the day to day infections. the bacteria are not clearing up from your body completely when you are using medicines. probably you are not using the course completely that is why the bacteria has developed resistance to those drugs. I advise you to consult a physician as well for as a whole diagnosis and treatment. You may have to undergo culture and sensitivity test besides other routine tests for confermation. Rash
may be fungal infection
or an allergy
to the under garments, stop wearing them or change the type of the undergarments like loose one or of cotton cloth.
Besides i advise you to follow some diet recomendations as take more of green leafy vegetables, pulses, sprouts, milk, egg, meat, seafoods, fruits, and juices to increase blood, general health and resistance to fight the infections. Wishing for a quick recovery and thanks for calling.