The Good: Pyrethrins, for the most part, do seem to be relatively safe for most pets, though dosage is still the key. Many on-line sites list pyrethrins as being safe for cats, and as far as we can tell, used judiciously, they are not too much more toxic for cats than they are for dogs.
Yes: Razor bumps will usually go away when you stop shaving. There are a few things you can do to prevent them in the future. Shave in the shower so the heat can soften the hair, and use a shaving gel. Always use a brand new razor, and shave in the direction that your hair grows. Moisturize after shaving.
Best Answer: Sea Breeze helps the itch to stop, if you have that. If you don't scratch the bites and you are not very allergic, they will go away within a few days. If you're highly allergic, even if you don't scratch them it could take weeks. If you scratch them, they won't go away for weeks and weeks - not until you stop scratching them, at any rate.