Thank you for the query.
Vomiting and abdominal pain
if located on the upper abdomen can be caused by gallstones or peptic ulcer. Gallstones pain usually radiates to the back.
Also gastrointestinal infection
or food allergy
Skin rash seems to be caused by an allergy.
Cramping, vomiting, rash can be also caused by inflammatory bowels diseases (like Crohns disease
). In such case your abdomen should get bloated and gas obstructed.
I suggest you to visit a doctor. Blood work, liver tests, abdominal ultrasound, abdominal X-ray
, urine analysis, stool tests should be done at first. If all this tests will be negative, colonoscopy should be considered.
Hope this will help.