Rash 16 Months My 16 Month Old Daughter Has A Pimply Looking Rash On Her Back And Legs?

My 16 month old daughter has a pimply looking rash on her back and legs? - rash 16 months

I realized that a week ago and seems to have deteriorated. Now she's scratching, which are accompanied by itching. On the back and rear legs (thigh) no idea what could be. I recently had an ear infection and was not noticed Amoxicilan however, has a rash until 4 days later, his medication.