Welcome to HCM,
blood during defecation may have various etiology ,any injury
to gastric canal ,like ulcer ,mechanical injury of any kind to anal canal
,vit k deficiency etc .the color generally indicates the part of gastric canal involved in pathology .
Careful investigation is required for proper diagnosis ,however you may use vit k in oral form in interim ,with anti ulcer drugs like omeprazole
20 mg once a day ,empty stomach .
Hope i required your query