Thank you for your question. It is important that the patient feels comfortable in their recovery technique. You should follow the recommendation of your board certified facial plastic surgeon and monitor how the recovery process feels on your skin.
If you had Erbium laser resurfacing then you can wash the treated area. It's best to do it a couple times a day. You want the area to look clean and pink. Try to avoid the yellow buildup, that will only delay your healing. The temperature doesn't really matter as long as it's comfortable and not burning hot. Also, applying ice packs will also help the swelling go down. Good luck during your recovery!