10 Autoimmune Conditions That First Appear as Skin or Eye Changes

10. Inflammatory Bowel Disease - When Gut Inflammation Shows on the Surface

Inflammatory bowel disease, encompassing both Crohn's disease and ulcerative colitis, frequently manifests through extraintestinal symptoms that can appear on the skin and eyes, sometimes preceding gastrointestinal symptoms by months or years. The most common dermatological manifestation is erythema nodosum, appearing as tender, red nodules typically on the shins and ankles, which often correlates with active intestinal inflammation and can serve as a marker for disease flares. These painful lesions can make walking difficult and may leave behind areas of hyperpigmentation as they resolve. Pyoderma gangrenosum represents a more serious skin manifestation, beginning as small pustules or nodules that rapidly progress to deep, painful ulcers with