Very difficult to comment on pigmentory disorders with out visual examination.However this looks post-inflammatory, Did you apply cremes containing hydroxyquinolones (for blemishes) or steroid containg cremes? Also the possiblity of excessive sun exposure need to be explored.
I have taken a few topical ointments for my skin as a teen and in my early 20s. I could only remember benzoyl peroxide, clindamycin phosphate lotion 1%, and retin-a. 10 years ago I took accutane for 4 months for mild/persistant acne. I have been sunburned about 4 or 5 times as a child and in my teens, but I am always wearing hats and sunglasses when outdoors to protect my face.
When diagnosed by a PA for having tinea, I was prescribed oxistat (oxiconazole nitrate lotion 1%) and cutivate (fluticasone propionate lotion .05%). It made me breakout and did nothing to eliminate the white blotches.
I just thought of a few possible causes. The blotches tend to be the most noticable on the right side of my face...Can it be my pillow- an allergic reaction to detergent or the radiation effects of cellphone/smartphone use. This may seem far fetched, but I am desperate for a solution.
It can be pityriasis alba (although less likely at your age) or post inflammatory hypopigmentation. Pityriasis alba is a flaky, hypopigmented, patchy dermatitis with fine scales involving the face and, at times, the neck and shoulders. No treatment is required and the patches in time will settle in due course of time. The redness, scale and itch if present may be managed with simple emollients and sometimes hydrocortisone, a weak steroid, is also used. Severe cases may require PUVA therapy.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.