Dry Skin (Xerosis): This condition is a common cause of itching on the feet and scalp. The pins and needles sensation on the face could be related to dry skin or an allergic reaction, but in the absence of other symptoms, dry skin is a plausible explanation.

Eczema (Atopic Dermatitis): Eczema can cause itching on various parts of the body, including the feet and scalp. The facial pins and needles sensation could be due to an allergic component or irritation.
Psoriasis: This autoimmune condition can lead to itching and skin lesions on the scalp and feet. The facial sensation might be related to stress or an unrelated condition, but psoriasis should be considered.
Allergic Contact Dermatitis: An allergic reaction to a substance (e.g., hair dye, soap, or lotion) could cause itching on the scalp and feet, with the facial pins and needles sensation being an unrelated or related symptom.

Multiple Sclerosis: Although less likely, multiple sclerosis (MS) can cause pins and needles sensations, including on the face. Itching can also be a symptom of MS, especially if there's a lesion affecting the spinal cord.
Diabetes Mellitus: Diabetes can lead to peripheral neuropathy, causing pins and needles sensations. Itching, especially on the feet, can be a symptom of diabetes due to dry skin or neuropathy.
Hypothyroidism: This condition can cause dry skin, leading to itching, and peripheral neuropathy, which might result in pins and needles sensations.

Pernicious Anemia: A deficiency in vitamin B12 can cause neurological symptoms, including pins and needles sensations, and might lead to itching due to associated skin conditions.
Neurosyphilis: In its late stages, syphilis can affect the nervous system, leading to a variety of symptoms, including itching and abnormal sensations.
Sjögren's Syndrome: This autoimmune disorder can cause dry skin and mucous membranes, leading to itching, and might result in neuropathic symptoms like pins and needles sensations due to associated neuropathy.