Hi, thanks for writing to HCM.
Based on the description, I suspect that the small bump is a Dorsal ganglion cyst
of the wrist which typically presents with a dent adjacent to it.
There is absolutely nothing to worry about this, as it is a benign condition and is generally harmless. No specific treatment is necessary.
If it is painful or producing restricted movements of the wrist, temporary use of analgesics like Advil
will help in reducing the pain & inflammation.
If it is bothering you much, then a surgical excision may be indicated.
Hope this information is helpful. Good day