Thanks for your query.
So you have two concerns , You have pimples and secondly your skin colour is getting darker and dark spots on face.
First of all I suggest to stop using lomela as it contains momatosone, a steroid (along with tretinoin
),which can cause side effects on face if used for long time.The fair colour you feel is actually hypo pigmentation caused by momatosone.
Instead of self medication
I suggest you to meet a dermatologist
for treatment of acne in the form of creams, oral medications and chemical peels
Peels will also help in improving skin tone and reduce dark spots.
Once acne is under control treatment for dark spots can be started.
Hope this solves your query.