When and where do units heal any damage in a turn?

Units heal damage at two specific times during a turn. According to Rule 142.3.b and the associated FAQ, these times are:

1. During a Combat Cleanup: This occurs after any combat showdown resolves. When a combat showdown ends, all units on the board (both at the base and at any battlefield) heal all damage.
2. At the end of each player's turn: This occurs during the End of Turn Cleanup step (Rule 317.2.b).

Key Points Regarding Healing:

• Global Healing: When healing occurs after a combat showdown, it applies to every unit on the board, regardless of their location or whether they participated in the combat.
• No Immediate Healing: Units damaged by spells or abilities outside of a showdown do not heal immediately. They remain damaged until the next combat showdown occurs or until the end of the turn, whichever happens first.
• Non-Combat Showdowns: Units do not heal during non-combat (uncontested) showdowns. Healing only occurs after combat showdowns and at the end of the turn.
• Persistence: Damage dealt to a unit persists on that unit until one of the two healing windows above occurs.

As stated in Rule 405.1: "Damage being cleared from Units is Healing."