Dry Skin (Xerosis): This is a common condition that can cause itching and, if severe, can lead to petechiae due to scratching. Dry skin is especially prevalent on the feet due to environmental factors and the natural tendency for skin on the feet to be thicker and drier.

Eczema (Atopic Dermatitis): A chronic condition characterized by itchy, inflamed skin. It can cause petechiae if the skin is scratched excessively.
Contact Dermatitis: An allergic or irritant reaction to substances like soaps, detergents, or certain materials in shoes. It can cause itching, redness, and potentially petechiae.
Scabies: A parasitic infection caused by the mite Sarcoptes scabiei, leading to intense itching and skin lesions, which can include petechiae.
Fungal Infections: Such as athlete's foot (tinea pedis), which can cause itching, redness, and potentially petechiae if the skin is broken.

Meningococcemia: A severe infection caused by Neisseria meningitidis, which can present with petechiae or purpura. Although rare, it is life-threatening and requires immediate medical attention.
Thrombocytopenia: A condition characterized by low platelet count, which can cause petechiae. Itching is less common but can occur due to associated conditions.
Vasculitis: Inflammation of the blood vessels, which can cause petechiae and a variety of other symptoms depending on the vessels affected.

Leukemia Cutis: Skin involvement in leukemia, which can cause a variety of skin lesions, including petechiae.
Amyloidosis: A condition characterized by the deposition of amyloid proteins in various tissues, which can cause petechiae among other symptoms.
Mastocytosis: A disorder caused by an accumulation of mast cells in one or more organs, which can lead to skin lesions, including petechiae, and itching due to mast cell degranulation.