Hello mam....  First of all sorry to hear about the incident.  Cracker burns will not be the same kind of superficial burns what u get while cooking,  or when coming in contact with hot liquids etc...  The latterone,  u can go away with few of the home remedies n burn ointments,  which again are available in plenty n unspecific... The cracker burns however are high intensity burns,  with lot of soft tissue damage and associated foreign materials like gunpowder deposition,  which causes lot of infection.  The earliest u take an appointment and show it to me or any other hand surgeon,  the better.  Thorough wash under local anesthesia n further management will be required.