Plastic surgeon caused a wound on my nose while he was doing nose job, is it considered medical malpractice?

No: At times the skin is very adherent to the underlying structures and it is not uncommon for a small tear to form in the skin in the course of a rhinoplasty. These usually heal very well without any residual scarring.

Doctors can't give: Legal advice, but there are lots of reasons you might have a wound on your nose after rhinoplasty surgery, most of them unrelated to medical malpractice of any kind. Are you a smoker? Did you remove your tapes or splint before your surgeon advised? Did you have an infection? Did you pick or blow your nose? Talk to your surgeon about your surgery and stop thinking lawyers!

Needs expert eval. : There are many risks inherent in all procedures. Whether one particular outcome is is considered to be within the "risks of the procedure" need to be evaluated by a physician considered as an expert in that particular field. You may want to consult a malpractice attorney, who if he feels the results warrantit, will have the case evaluated by an expert in the particular field.

Risks of surgery: In surgery, there are always risks. As long as the wound is mild and was able to be fixed, i think that this is within the realm of an acceptable risk.

Yes : A wound infection can happen after surgery. Best course is to see if its resolved and if the surgeon can be or any further assistance.