What could be the cause of multiple small white bumps on the arms and chest? (photos)

Thanks for sharing your photos with us. This is probably milia and they can be removed easily with a Smartxide CO2 laser. However, it can recur as some of the doctors here have mentioned. A good skin care regime, scrub or peel can help prevent the recurrence. The CO2 laser burns off these milia with minimal scarring and the downtime is usually about 2-3 days depending on each individual. I hope this answers your question. Have a great week ahead and all the best!

By keratin bumps, i assume you are referring to Milia seeds? There are many types of skin bumps that can form on the face (and off), and treatment is largely similar - they can be removed with an ablative laser and the contents within (if any) removed physically. After removing them, it is important to maintain on a good skin regimen that includes the use of Alpha or beta-hydroxy acid-based toners and adapalene or retin creams; this reduces the recurrence of these bumps and helps rejuvenate the skin.