I just found out that my cat had some kind of allergy and well she had an itchy lesion on her head, the vet said it wasn't anything serious and that all I had to do was put an ointment on her wound. Almost a week later she is now sneezing uncontrollably and I am really worried that this could be a sighn of something serious. She is still active and seems to be happy but the poor thing sneezes all the time. Should I take her back to the vet? What is wrong with her?

Call the vet.

Anytime something strange happens after recent vet visits, it is important to call the vet as soon as you notice it. If its serious, the vet should be able to take measures to get you help even outside normal office hours.

Thank you for posting and good luck!

HI,
Thank you for posting a question here, and Welcome to this site.
Sorry to hear about your cat. Please either call your Vet, and tell him/her it's getting worse with the sneezing, or consult with another Vet.
Your Vet needs to know that his/her suggestion about simply using an ointment (Hydrocortosone, 10%, is good for itching), is not doing the job.
Best of luck.