Lupus and the Foot: A Frequently Overlooked Connection

Systemic lupus erythematosus (SLE) — commonly called lupus — is a complex autoimmune disease that can affect virtually every organ system in the body. The feet, while not among the headline manifestations of lupus (kidneys, skin, joints, blood), are affected in a significant proportion of patients and the foot problems that result can substantially impact daily function and quality of life.

Lupus affects approximately 1.5 million Americans, predominantly women of childbearing age, with Black, Hispanic, and Asian women having higher rates and often more severe disease than white women. The podiatric complications of lupus — including arthritis, Raynaud’s phenomenon, peripheral neuropathy, skin ulcers, and medication-related side effects — require specialized management that integrates with the overall rheumatological care of the disease.

Arthritis in Lupus: Joint Pain and Structural Changes

Arthritis is one of the most common manifestations of lupus, affecting up to 95% of patients at some point during their disease course. Lupus arthritis typically causes pain, swelling, and stiffness in multiple joints — including the feet and ankles. Unlike rheumatoid arthritis, classic lupus arthritis is generally non-erosive (it doesn’t destroy joint cartilage and bone), though a subset of lupus patients develop a more destructive arthropathy.

Jaccoud’s arthropathy is a characteristic lupus-associated joint pattern where repeated episodes of joint inflammation cause progressive ligamentous laxity and joint instability without actual cartilage destruction. In the feet, this produces reducible deformities similar to hammertoes, subluxations, and flatfoot — deformities that can be passively corrected but recur with loading. Custom orthotics provide important functional support for Jaccoud’s arthropathy by stabilizing the hypermobile joints.

Tendinitis and tenosynovitis — inflammation of tendons and their sheaths — occur commonly in lupus and affect the foot tendons including the Achilles, posterior tibial, peroneal, and flexor tendons. These inflammatory tendon conditions require anti-inflammatory treatment (systemic medications through rheumatology, and local management through podiatry) and appropriate biomechanical support during the inflammatory period.

Raynaud’s Phenomenon: Cold-Induced Circulation Problems

Raynaud’s phenomenon affects approximately 40% of lupus patients, causing exaggerated vasoconstriction in response to cold or emotional stress. The toes (and fingers) turn white (pallor) from arterial spasm, then blue (cyanosis) from blood pooling, then red (hyperemia) as blood flow returns. This tri-color change is the classic presentation, though not all patients show all three phases.

Raynaud’s in lupus patients can be severe and cause significant pain, numbness, and functional limitation in cold weather. In severe cases, repeated ischemic episodes damage the tissue, causing digital ulcers at the fingertips or toe tips — non-healing wounds that are very painful and at risk for infection and permanent tissue loss.

Management includes aggressive avoidance of cold exposure (wearing warm socks and insulated footwear, avoiding going barefoot even indoors in winter, keeping the whole body warm), smoking cessation (which dramatically worsens vasoconstriction), and medications including calcium channel blockers that reduce vascular spasm. Patients with digital ulcers require specialized wound care and may need intravenous vasodilator therapy for severe cases.

Skin Manifestations Affecting the Feet

Lupus produces several skin manifestations that can affect the feet. Vasculitic skin lesions — resulting from inflammation of small blood vessels — appear as palpable purpura (raised purple spots), livedo reticularis (a mottled, net-like skin pattern), or digital infarcts (areas of tissue death from vessel occlusion). These lesions on the feet require specialized wound care and adjustment of the systemic lupus treatment.

Lupus profundus (panniculitis) — inflammation of the subcutaneous fat layer — can rarely affect the foot, creating painful nodules that may ulcerate. This is distinguished from other causes of foot nodules by biopsy and clinical context.

Chronic skin ulcers from a combination of vasculitis, Raynaud’s, and corticosteroid-thinned skin are particularly challenging to heal in lupus patients. The immunosuppression required to control lupus impairs wound healing, while the disease itself creates the wounds. Management requires close collaboration between podiatry and rheumatology to optimize both wound care and systemic disease control.

Medication-Related Foot Problems

The medications used to treat lupus create their own foot health challenges that podiatrists must understand. Long-term corticosteroid use — common in lupus management — causes bone loss, tendon weakening, fat redistribution, skin atrophy, and impaired wound healing. Avascular necrosis of the talus or other foot bones is a rare but serious complication of high-dose corticosteroid therapy.

Hydroxychloroquine (Plaquenil) — a mainstay of lupus treatment — rarely causes a myopathy affecting the calf and lower extremity muscles. Patients who develop unexplained lower extremity weakness or difficulty walking while on hydroxychloroquine should have this side effect considered.

Immunosuppressive medications (azathioprine, mycophenolate, cyclophosphamide, biologics) impair the immune response to infection, making foot infections — including bacterial cellulitis and nail fungus — potentially more serious and harder to treat. Diabetic-level vigilance about foot wound prevention and prompt treatment of any infection is appropriate for lupus patients on immunosuppression.

Podiatric Care for Lupus Patients

Lupus patients benefit from regular podiatric evaluation as part of their comprehensive care. We assess for active inflammatory arthritis, tendinitis, and skin changes at each visit; provide custom orthotics to support hypermobile joints and reduce arthritic pain; monitor wound healing carefully given the impaired healing environment; provide professional nail care given the immunosuppressed state; and coordinate with the patient’s rheumatologist on foot-specific issues that relate to overall disease management.

Frequency of podiatric visits depends on disease activity and the complexity of foot manifestations — some patients need quarterly monitoring while others can be seen less frequently during remission. At Balance Foot & Ankle, we welcome lupus patients and provide the specialized, attentive care their complex needs require. Please share your lupus diagnosis and current medications at your first visit so we can tailor our evaluation accordingly.

Foot or Ankle Pain? We Can Help.

Balance Foot & Ankle — Howell & Bloomfield Township, MI

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Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.