Can raynaud's and livedo reticularis cause severe cramping in one area of the calf when I sit too long?
May not be. What needs to be known is why you have livedo reticularis and raynauds. Calf cramping can be due to many reasons as well as vascular issues which you may have. Your physician would be able to clarify this or may send you to a Rheumatologist to help clarify thr diagnosis and the reason for cramping.
No . it affects small capillaries and arterioles.
I've developed raynaud's. Also have livedo reticularis all over my body which seems to be getting worse. I know these can both be primary conditions, but should I be worried about an underlying issue?
See a Rheumatologist. This is a uncommon condition which should be handled by a specialist who deals with collagen-vascular conditions . There can be an underlying cause which requires detailed investigations to rule it out. That is where your rheumatologist/consultant can make an important contribution to your welfare. Read more...
Systemic disease. Yes, see a rheumatologist for a complete workup. Read more...