Coagulopathies , bleeding tumors , gastric ulceration , and external or internal parasites should be excluded as causes .
凝血功能障碍、肿瘤出血、胃溃疡、及体内或体外寄生虫,应作为可能的原因并逐一排查。
However when they injected the hind leg of mice with the cd47 suppressor , it showed much less hair loss , ulceration and peeling when targeted by radiation than an untreated leg .
This can happen if the std causes ulceration or breaks in the skin ( e.g. syphilis or herpes ) , or if it stimulates an immune response in the genital area ( e.g. chlamydia or gonorrhea ) .
If no evidence of external bleeding is found , a source of internal or occult blood loss must be sought , eg , a ruptured splenic tumor , coagulopathy , gi ulceration or parasites , or other neoplasia .