I have used tretin 0.05% for my mild acne. to improve my skin tone, kojic skin lightening cream is used. but i have experienced mild bumps on my face.

In my experience: a product like the kojic acid lightening cream would be more likely to be impacting or causing the facial bumps than the Retin-A/retinoid product. It does cause skin irritation in certain individuals. I would stop the lightening cream and see what happens. It might take 2-4 weeks to see any affect. If bumps persist, see your prescribing Dermatologist. Good wishes:)