Hello,
The birth control pills have to be started on the first day of the periods or on first Sunday after your periods. So you can start with a new pack of birth control pills on first coming Sunday after your periods(Sunday start).
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Your birth control pill should be taken on a daily basis if that is what you are talking about.