I am male 23 yo with very mild acne . But I still wanted to get rid of it . I went to a dermatologist and she prescribed me topical differin and oral doxycycline and I didn't take the fact that docy can increase your sensitivity to sun and cause skin discoloration . I used it for only 4-5 days 100mg/day and I didn't take the sun thing seriously .. then I got irritated reddish discoloration on my cheeks . I am not sure whether it's because of the docy but I think it's. I use mioxidil 5% for my beard and it caused my skin to be very dry recently ( maybe this is the cause not the docy , but I use minoxidil for 3 months so that decrease the probability ) .

1/ How can I make sure that is caused by docy or not .
2/ How can I treat it? , it's now 1 month and it hasn't resolved

btw I am on my 10th day on Accutane 20mg/day . And I really think of stopping and take care of the discoloration .