Can flea medicine cause dark, bloody skin and hair loss in dogs?

Question

Hello, somewhere month ago my dog had fleas and i used medicine against fleas on her skin started turning darker, there were somewhere spots were she wasnt hair. I thought that it wasnt because she was itching but it became bad, minute ago i sad spots with blood on it so im worried. Can medicine against fleas hurt dog skin?? Pet's info: Dog | Russian Toy | Female | spayed | 4 years and 9 months old | 8.5 lbs

Megan, DVM, CVA · Accepted Answer

Depending on the type of flea preventative you used then yes they can have a local reaction. If the spots that are irritated are not in the area that you put the flea medication then it is likely not due to the medicine. If it isn't in that area then I would be concerned about a reaction to the flea bites, an allergy to something else, or even a skin infection. I would have your vet look at her to see what is the cause of the skin issues. They will be able to prescribe some itching medicine and possible antibiotics if needed. I hope this helps!

Can flea medicine cause dark, bloody skin and hair loss in dogs?

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