Hello, andto BP.net.
The bump may be a scar from a previous rodent bite if he was being fed live prey. There is a skin condition that they can sometimes get, but I haven't heard it mentioned recently, so I'll have to do some research.
The excessive nose rubbing could be a sign of stress. If you could post a photo of the eclosure and answer the following questions, it would help.
-What size of enclosure is it?
-What are you using for heat, and how are you controlling it?
-What are your current temperatures and humidity, and what are you using to measure them?
-How long have you had the snake?
-How many times have you tried to feed it and how often?
-What do you have inside the enclosure as far as hides, bedding, etc?
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