I am highly concerned about your complaints. Multiple bruises over body developing over days, without any history of trauma, indicates some sort of bleeding or coagulation disorder. Also lump pathology has to be diagnosed. In this case it is better to get this examined by pediatrician
first, get some coagulation profile done, then if required FNAC or biopsy
of lump will help. I am sure your child will get well soon. Thank you.