This way, you stay on the same schedule, which makes it easier to tell if you've taken your pill on the
right days. If you're on
a triphasic pill
(google it to find out which ones are which) instead of a monophasic pill, you'll probably get a period either way, because the active pill dosage rises each week, and the drop in hormone levels in the new pack can make you bleed.
The rash part is weird, and you should ask your doctor about it. It might be unrelated.