Bald spots appear for two reasons. The first, as you mentioned is stress. They will rub urticating setae off the back of their abdomen if they are irritated. This can be from lots of different reasons. The new environment could be a cause. If it is not completely comfy in its new environment it may be stressed.

Since you have no other indicated reasons, other than the new environment, the other likely reason is an upcoming molt. When they are coming up on a molt, they will usually develop a bald spot. This can be a month or two out. When the molt gets about a week away, the bald spot will turn dark. A bald spot alone does not always mean a molt, but if it turns dark, it is certainly a molt.
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KJ Vezino
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Missouri Tarantula Enthusiasts Group

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