You clear me some things, and I am really grateful for it... yet I have only one question

I am 15 years old, and I was prescribed to eat one pill of doxycyline 100mg a day for a month. After the month, he now told me to take one pill every two days, and consequently after the breakouts stops. Right, now I don't think it's working at all, but the amount of acne I have nowadays is much less than before.

P.S: I have a delicate stomach, plus inherited atopy

Im on minocycline once day, I just read on FAQ it's rarely related to developemenr of lupus. Should someone with lupus NOT take minocycline?
Background - I have reynauds phenomenon and positive ANA. Along with a laundry list of non-serious symptoms. I was not diagnosed with lupus(good) but told it was highly suspected and should treat myself as someone with a dx. This happend years ago and haven't had incidnce since(knock on wood)