My daughter had a very rare tumor on her buttock.a year ago. now she having pain in the same leg and bruises are coming up. could it be another tumo?

Possible: Not knowing what type of tumor she had to start with makes it very difficult to state whether it could be a recurrence. Some types of tumors, for instance the tumors associated with tuberous sclerosis, frequently recur and/or new ones appear. This is a question best asked to the doctors who dealt with her last year. Also, unusual bruising always requires at least a minor investigation.