Does the sun affect how your face looks 3 days post needling with PRP?

Hello and thank you for your question.
You do want to avoid sun until the redness is gone. The skin has been traumatized and you need to allow for healing. Heat will also effect the healing process. Try to stay cool the first few days and follow your post procedure instructions. Using a calming cream will help the healing process, ZO Revitatrol is excellent for aiding in post procedure healing. Then you are out wear your sunscreen and sun protection to avoid direct exposure. The skin will begin to heal
Best to you,

Realistically if you have receive a small amount of UV it will not affect your microneedling PRP procedure 3 days after. However because your skin pigment cells maybe 'active' after trauma, prolonged exposure is not recommended, especially if energy based microneedling was used. Follow the guidelines as specified by your specialist, and your skin will heal up just fine. Dr Davin Lim.