Hi stranger! Signing up for MypetMD is easy, free and puts the most relevant content at your fingertips.

Get Instant Access To

  • 24/7 alerts for pet-related recalls

  • Your own library of articles, blogs, and favorite pet names

  • Tools designed to keep your pets happy and healthy



or Connect with Facebook

By joining petMD, you agree to the Privacy Policy.


Q. Hi, I recently put frontline plus for cats on my cat and I noticed within a few days later he has a red bald spot around the area I put the medication

Answered By
LINDSEY EDWARDS MVB, BSC, IVCA

A. Some cats are very sensitive to the ingredients in frontline and hairloss and reddening is a recognised undesirable effect. I recommend you use a different product in the future, preferably an oral product as it is usually the carrier ingredients which are related to the sensitivity and not the fipronil medication so many spot on medications could have similar effects. It should heal uneventfully but if the skin becomes broken or painful it may require treatment by your vet - be sure to mention what was applied and take the batch number with you If you still have the packet


DISCLAIMER: The answers in Ask petMD are meant to provide entertainment and education. They should not take the place of a vet visit. Please see our Terms and Conditions.

CAN'T FIND WHAT YOU'RE LOOKING FOR?

Ask an expert about your unique situation now FOR FREE!

IMPORTANT: The opinions expressed in Ask petMD content area are solely those of the User, who may or may not have medical or scientific training. Our Ask petMD experts include veterinarians, vet techs, veterinary students, pet trainers, pet behaviorists and pet nutritionists. These opinions do not represent the opinions of petMD. User-generated content areas are not reviewed by a petMD veterinarian or any member of the petMD editorial staff for accuracy, balance, objectivity, timeliness, or any other reason except for compliance with our Terms and Conditions. petMD does not endorse any specific product, service, or treatment. Do not consider petMD user-generated content as medical advice. Never delay or disregard seeking professional medical advice from your veterinarian or other qualified healthcare provider because of something you have read on petMD.