Several infectious skin diseases also cause a rash. These can be caused by a number of infections with bacteria or viruses, and infestations of mites within the skin. Some infectious skin diseases, such as scabies, are caused by mites that bore into the skin surface causing irritation and a localised rash.
Now, as for your question about when to start taking oral contraceptives, there's really no hard-and-fast rule about when to start taking birth control pills. Starting in the first few days of your cycle is the surest way to prevent inadvertently taking pills while you are pregnant.
âPerfect useâ requires a woman to take the pill every single day at the same time without skipping a dose or being late on starting a new pill pack. When taken perfectly, birth control pills are 99 percent effective in preventing pregnancy. However, most women donât take birth control pills in this manner.