since your child did not have fever so we are suspecting inflammatory etiology
what the possible could be
1. Henoch-Schönlein Purpura
2. idiopathic thrombocytopenic purpura
3. urticarial rashes
give more detail of illness of child
edema of hand and feet
lymph nods
abdominal pain
etc
consult to
pediatrician near by urgently