4 weeks post op, can I use sunscreen on scars or could this potentially cause infection?

I advise my patients they may suntan with SPF 30 or better after 3 weeks and none have developed an infection. Always a good idea to check with your surgeon's protocol.Dr. Ted Eisenberg, Board Certified Plastic Surgeon and Author

In most cases I would expect you to be well enough healed at 4 weeks that sunscreen should pose no risk and is beneficial in reducing redness from sun exposure.  If any doubt please check with your surgeon.

Hi and thanks for your question and congratulations on your recent procedure. I typically have my patients using a special scar cream that also has an SPF in it about 3-4 weeks post op. As long as your incisions are healing without any issues, it should be safe to use an SPF. Please make sure to follow up with your surgeon regarding any questions, being that all surgeon have different preferences.Hope this helps.