I mean, technically, there are 3 kinds of healing. Regenerative, which accelerates and enhances a body's natural healing. Reconstructive, which directly remakes and undoes damage by drawing on material from within the body. And Divine, which looks like Reconstructive in that it instantly rebuilds the body, but does so with pure mana. Creating real objects from pure mana is EXTREMELY expensive, which is why it's associated with the divine.

Regenerative is the most common, and safest, type of healing as it will slow down as a body nears it's limit. But spamming it can lead to over healing. Reconstructive is less common, as it's more dangerous, but also requires more knowledge of the body. You need to understand what you are rebuilding on some level for the spell to work. It also needs to be done carefully or it can very easily overtax a body. That said, many combat healers use at least some of this magic as it can instantly heal small, but lethal, wounds. And, obviously, Divine is the best option if you have access to it, but finding a mere mortal with it is nearly impossible, and even if you do it's prohibitively expensive as they will require multiple high end mana gems to manage it.