Peripheral nerve compression or neuropathy: This is the most likely diagnosis due to the localized nature of the symptoms. Compression or damage to the peroneal nerve, which runs down the lateral aspect of the leg, can cause tingling in the lateral thigh, calf, and foot.

Lumbar radiculopathy: Compression or irritation of the lumbar nerve roots (L4 or L5) can cause radiating pain, numbness, or tingling down the lateral leg, calf, and foot.
Femoral neuropathy: Although less common, compression or damage to the femoral nerve can cause symptoms in the thigh and may radiate down to the calf and foot.
Sciatica: Inflammation or compression of the sciatic nerve can cause symptoms ranging from mild tingling to severe pain down the back of the leg, which may include the lateral calf and foot.

Stroke or transient ischemic attack (TIA): Although less likely given the localized nature of the symptoms, it's crucial to consider stroke or TIA, especially if there are any associated neurological deficits or risk factors.
Multiple sclerosis: An initial presentation of multiple sclerosis could involve numbness or tingling in various parts of the body, including the legs.
Guillain-Barré Syndrome: A rare autoimmune disorder that can cause ascending numbness, tingling, and weakness, which could start in the legs.

Vitamin deficiencies (B12, B6): Deficiencies in certain vitamins can lead to neuropathic symptoms, including tingling in the extremities.
Diabetic neuropathy: Although more commonly associated with distal symmetric polyneuropathy, diabetes can cause a variety of neuropathic presentations, including focal neuropathies.
Toxic neuropathy: Exposure to certain toxins can cause neuropathic symptoms, including tingling in the legs.
Vasculitis or vascular disease: Conditions affecting blood flow to the nerves can cause neuropathic symptoms, including tingling, though these would typically be accompanied by other symptoms such as pain or weakness.