Hello. I Am 26 Year Old Female And Am Suffering

Hello. I am 26 year old female and am suffering from acne since 2 years. I belong to a hill station so the amount of sun exposure is pretty high and has resulted in a number of unsightly sun spots. However, the current concern is of acne which is mild but persistent. I visited a derm and he prescribed an antibiotic with other topical gels containing BP, Clindamycin etc, but that didnt seem to work even after 5 months of treatment and then the intensive treatment started with isotretinoin 20mg/day( I am 52 Kilos). This has really helped, the greasiness of my face is gone, the comedones have started to shrink and appear scabby and only few bumps are present on the skin now, but scars are still there to which i was said they'd fade in some two months. So far so good but the problem is i have tanned a lot, appear so dark while the rest of my body and neck is milk white, and have flaky dry skin and chapped lips, i was told though. I am suggested to use Venusia face cream for dryness and peeling, but am afraid if it might lead to another breakout. Pls do give your wise suggestion and guidance on what I should do for tanning while on Isotretinoin and also to handle pigmentation. Thankyou