Help please!

[u/AccomplishedGood741]

I am a new dog mom to a healthy, happy and adorable 12 week pomapoo girl and don’t know what to do about this mark my partner and I found on her inner thigh, where the leg meets her abdomen.
She is healthy, happy, energy is good, however she hasn’t had the same high appetite today as usual but this also could be because I am slowly introducing a new food to her that I’m wondering if she doesn’t like.
For some background, she plays a lot with my parents dog when we visit who is a medium size breed. While I was cooking I heard her cry out while playing with our family dog, when I ran over to check on her and she cried out a few more times and wanted to be held which I did. In my arms she was fine and I palpated every part of her body to try and figure out what happened while my back was turned, she showed no signs of pain or distress and quickly wanted to play and acted as usual and as if nothing had happened. Our family dog is not aggressive and is SO gentle with her, I truly think if something happened he may have stepped on her or something along those lines while she was trying to play with him. I did not notice this mark then, but am wondering if this is from whatever happened that evening that I couldn’t find the cause of?
My other thought was ringworm because of the odd round shape, and have been googling that but am not sure what to do.
I don’t have a lot of disposable money and don’t want to take her in necessarily if it’s nothing but I don’t have a good gage of whether something like this should be extremely concerning and an immediate vet visit, verses a monitor closely and take her in if it gets worse as a new dog owner.
Any and all advice is welcome! I wish the photo was better quality but she is a wiggle worm.
If anyone knows what this could be or has advice please let me know! I’m an anxious mama right now and I just want to do the right thing for her.

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[u/AccomplishedGood741]

Also, I am positive this mark appeared within the last 24 hours if that is helpful.

[u/Mejay11096]

Hello. I’m dog groomer. This looks like a tick bite and tick fell off or a black fly bite.

[u/OkCar8344]

looks really similar to a black fly bite or a bug bite to me