Growing scab

my grandson has a scab on his right thigh, it was small a few days ago. I did not think much of it until now it has grown quite bigger and i am concerned. i am showing before and after photos which is a day apart

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if anyone knows what this is, please let me know asap

I would definitely take them to the Dr urgently. Not sure what it might be but if it is not healing & has grown bigger, please take them to get it checked out. All the best.