Small wound on cat

A couple months ago I found a spot on my cats leg that she was licking. She had licked all the fur away and the were as a cut that she continued to open up. I'm not sure how she got that wound, but it could have been from a nasty fall that she had a year prior and I had never noticed it. I took her to the vet and they gave her a shot of antibiotics in case it was infected and a shot of steroids. A few weeks later it was gone.

However, just the other day, I noticed a different spot on her leg. This time it was on her inner thigh on her back leg. I have no idea how long it was there. It could have been there just as long as the previous one. There are a few spots with scabs. I really have no idea where she got this from, but it seems to have a hard time healing with her licking. Her licking isn't awful though, as in she isn't doing it constantly, it was barely enough for me to be suspicious. She is also acting normal and eating fine.

They almost seem like large bug bites. Or maybe started as small bug bites and she made them worse. I have never seen any bugs around and she gets flea/tick medicine once a month. Also looks like there is a bit of a orange/yellow crust that is forming on the scab.

Any ideas?

I would take her in an have a vet look to it. Maybe take fluid/samples of it and test it. I've had bad experiences with odd lumps and bumps on my cats in the past so I take every one of them very serious. Best guess, is maybe an allergic reaction to the flea medicine or something in her environment. I had a cat allergic to fleas and topical flea medicine at one point so it is possible. But it could be something more serious so I wouldn't take the chance if it was my cat.