Good day jack, thanks for your question. I am glad to be able to provide assistance to you today. It is normal for a charger to get hot but not to the point that you cannot handle it and for this it will be best to have it be checked and not use it on your device for the time being just to be safe and this is also to avoid incurring additional issues that might happen and for this you can refer to the link below with regards to requesting for a service or for a repair.
https://support.microsoft.com/en-us/surface/how...
Regards,
Paul R.