 Stinging insects inject venom into their victims, whilst biting insects normally introduce anti-coagulants into their victims.The great majority of insect allergic animals just have a simple allergic response – a reaction local to the sting site which appears as just a swelling arising from the release of histamine and other chemicals from the body tissues near to the sting site.The swelling, if allergic, can be helped by the provision of an anti-histamine ointment as well as an ice pack.