Is this a lost scale?

[Shadyr]

While I was taking water out of Indigo's tank last night, he came up under the cup as I was putting it in, and I think I bonked him with it I saw this on him this morning - is this a lost scale?

He seems to be acting fine and eating normally. I've added some stresscoat and went out and bought some aquarium salt and a bigger heater (temperature can be set to what you want it to be!). Should that fix him up, or is this something other than a missing scale?

[Bombalurina]

Keep an eye on the patch. Looks like a missing scale to me, but I'm no expert on things like that. The measures you've taken will certainly heal it up if it is! :)