Can heavier moisturizer do more harm than good for acne?
For some. they can aggravate acne, but it is not universal. People with acne do have an underlying skin barrier defect, and using moisturizer can help address this issue, improving the acne and reducing irritation to topicals.
Should acne prone skin avoid oil cleansers?
No. Oil cleansers can help, as they help facilitate removal of dirt, sebum, and oil from the skin surface and pores.
Is tretinoin twice a week enough for acne?
It can be enough for acne, though varies by person.