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There is a damp line being formed behind the toilet commode, as seen in the picture. If we stop using the toilet for a few days, the wall dries out. Any suggestions on where the problem lies would be appreciated.

Edit:

I've added pictures of what it looks like with the lid off (the lid is usually left on) . I don't particularly see any signs of condensation on the inside. Also attached is a picture of the wall right behind the commode so you can see how far down the wall the damp line runs (annotated the level with a red arrow)

The toilet is on the 1st floor of a 2 story home. However, on the 2nd floor, there are no drain pipes right above this toilet that I can think of (there is a game room right above).

There is a damp line being formed behind the toilet commode, as seen in the picture. Any suggestions on where the problem lies would be appreciated.

Edit:

I've added pictures of what it looks like with the lid off (the lid is usually left on) . I don't particularly see any signs of condensation on the inside. Also attached is a picture of the wall right behind the commode so you can see how far down the wall the damp line runs (annotated the level with a red arrow)

The toilet is on the 1st floor of a 2 story home. However, on the 2nd floor, there are no drain pipes right above this toilet that I can think of (there is a game room right above).

There is a damp line being formed behind the toilet commode, as seen in the picture. If we stop using the toilet for a few days, the wall dries out. Any suggestions on where the problem lies would be appreciated.

Edit:

I've added pictures of what it looks like with the lid off (the lid is usually left on) . I don't see particularly see any signs of condensation on the inside. Also attached is a picture of the wall right behind the commode so you can see how far down the wall the damp line runs (annotated the level with a red arrow)

The toilet is on the 1st floor of a 2 story home. However, on the 2nd floor, there are no drain pipes right above this toilet that I can think of (there is a game room right above).

There is a damp line being formed behind the toilet commode, as seen in the picture. If we stop using the toilet for a few days, the wall dries out. Any suggestions on where the problem lies would be appreciated.

Edit:

I've added pictures of what it looks like with the lid off (the lid is usually left on) . I don't particularly see any signs of condensation on the inside. Also attached is a picture of the wall right behind the commode so you can see how far down the wall the damp line runs (annotated the level with a red arrow)

The toilet is on the 1st floor of a 2 story home. However, on the 2nd floor, there are no drain pipes right above this toilet that I can think of (there is a game room right above).

There is a damp line being formed behind the toilet commode, as seen in the picture. If we stop using the toilet for a few days, the wall dries out. Any suggestions on where the problem lies would be appreciated.

There is a damp line being formed behind the toilet commode, as seen in the picture. If we stop using the toilet for a few days, the wall dries out. Any suggestions on where the problem lies would be appreciated.

Edit:

I've added pictures of what it looks like with the lid off (the lid is usually left on) . I don't see particularly see any signs of condensation on the inside. Also attached is a picture of the wall right behind the commode so you can see how far down the wall the damp line runs (annotated the level with a red arrow)

The toilet is on the 1st floor of a 2 story home. However, on the 2nd floor, there are no drain pipes right above this toilet that I can think of (there is a game room right above).