It has to be in the past tense.
How do you say "It looked like she had a raisen on her head."
How do you think that it might be said?
Give your own attempt first and then someone will be happy to proofread it for you, and point you in the right direction.
What verbs do you think you might use for starters? Try the dictionary or the computer translator to give you some ideas or to get you close and then post your rough attempt on this thread. Then we can see if we can't help you polish it up a bit.