M. balfouri with black spots

[Sana]

Tonight while feeding I saw something new to me. My M. balfouri has some black spots on his carapace. He's recently been rehoused from a communal to a smaller individual enclosure after his brother matured and was loaned for pairing. He's fed crickets once a week and kept relatively dry with a water bowl. Can anyone tell me what this is?

 

[KezyGLA]

This is just exposed exo skeleton where tge setae has worn off.

Nothing to worry about.

 

[Sana]

Thanks!

 

[viper69]

Looks like melanoma

 

[Arachnophoric]

Just to add that those will disappear after he molts and the new setae come in. I notice this most often on Ts due for a molt.