I would recommend that you get a thermostat asap because the heatpad can very easily burn your snake. This is crucial please.
This could be what has happened? I'm not sure... Maybe also from the small hide like you say- could be markings from getting in or out.
I'm a new / first time owner myself and I know that a thermostat is absolutely key. Also it would be good if you can cover the back and sides of your terrarium- this helps with him feeling a lot happier and secure.
I'm sure others will chime in with advice with this
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