3 years baby boy back from school these type rashes over the back kindly management?

1n1/2 yr old male boy having this type of lesion since 4 day . Similar episode in past also but less in severity relieved by unknown medication

7 months young baby brought by grand mother with c/o papular rash on buttocks and legs (below waist) since 2 days. No other complaint. Dx & Tt.

Good afternoon Drs . child 2y/o with these lesions severe itching since 3 days no fever otherwise normal help me dx n Rx this baby

A 18yr old boy suffering from these types of Rashes.. diagnose it n Rx,??