Dark Circular Patches on Face (both Sides of Cheek)?

I am a 22 years old man.A doctor told me that I had dry skin and that the patches were the result of prolonged exposure to sunlight. Some 3-4 weeks before I had the patches I used to wash my face with dettol soap. I had some very minor burning sensations while using the soap and did not pay too much attention. The doctor prescribed eldopaque forte cream and stieva-A 0.025. I have noticed that the patches have gone darker,larger. Could it be that I had a dettol burn or allergy to the medicines?

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