The effect medication (for acne) has on my skin.

Patient: Hello, I used to have a mild case of acne on my face and it is now clearing up due to the use of a dermatologist face wash, pre scripted tablets and a cream . The question I have is that my face doesn’t seem to tan any more when I sit in the sun, I have yet to go on holiday since I have been using this dermatologist face wash but I over the past two years when just using normal face wash my face didn’t really gain any colour after sitting for long hours in the sun.I was just wondering do face washes damage your skin and is there anyway I can regain colour in my face?Thanks, Jake.