Urticaria after scratching

10 year boy came with these skin lesions developed overnight no history of any insect bite no previous similar symptoms kindly guide me in diagnosis and treatment for this boy

4 yr old baby presented with rash all over body ring form without itching disappears and come back on blanching immediately ,history of visible healed burn of 08 month back , afebrile. Dx and Mx?

### 7 years old boy with such elevated erythematous itchy skin lesions since 2 days. History of Measles Rubella vaccination 4 days ago. Diagnosis and treatment ???

A 4 month old infant developed this type of rash in the body .gaining weight no other problem

2yr baby having lesion all over body.....occasionally itching as informed by parents