Can the only presenting symptom of scleroderma be IBS diarrhea that comes and goes?

Diarrhea. Yes, scleroderma of the intestines can present like ibs with diarrhea coming and going. Diagnosis is usually made by endoscopy or xray.
See below. Scleroderma can have collagenous involvement of the GI or one can have bacteria overgrowth. However; there are usually other symptoms present of scleroderma.

Related Questions

In difuuse scleroderma would the only symptom be IBS diarrhea form?

Similar. In ibs the bowel is normal, just misbehaving. In scleroderma, the bowel is abnormal. Ibs can be cramping, constipation, diarrhea. Scleroderma is usually weight loss due to nutrient malabsorption, diarrhea and bloating due to bacterial overgrowth. Constipation can occur due to lack of intestinal contractions. Read more...
Possibly. If you have the characteristic skin changes it is possible that GI issues could be the only symptoms. It is doubtful one has scleroderma if there are no symptoms other than diarrhea. Read more...

Could IBS diarrhea form be the only symptom appearing including no skin involvement in diffuse scleroderma meaning no other symptoms but a positive ANA with negative ena?

Quite doubtful. In scleroderma, sacular diverticuli can form, but this is usually not early. In the absence of raynaud's syndrome, subungual capillary abnormalities (rheumatolgist use a 30x microscope to examine for this), and more specific serologies......I conclude your problem lies elsewhere. Read more...

How do you determine if IBS diarrhea is due to scleroderma?

Scleroderma of bowel. Scleroderma of the bowel can be recognized by an endoscopic examination done by a gastroenterologist. Because of the overgrowth of blood vessels in the intestines one can get the picture of a "watermelon"intestines. On xray the intestines loog k like a stack of coins. Read more...