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there is very little info in your post to help with an answer.  a photo would help a lot.  if not, a more complete description of the problem would help.  sounds like you are a mold using, slip pouring potter with a mold that produces a raised area on the finished bowl.  or, maybe ............................?  

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You might be able to sand it down to below the surface, then fill the voids with fresh plaster that you smooth as perfectly as possible - maybe by burnishing or laying on a smooth piece of plastic sheeting. Be prepared for irregularities, although you may not require a perfectly smooth form to work with. 

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Fill the design with a oil based clay, make a new master of silicone/urethane, and cast new mold off master. If design is positive in shape(in the plaster mold, not the casting); protrudes into mold, then possible to sand down, but if it's negative in shape it's unlikely youll be able to get new plaster to stick, especially if it's a thin design. 

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