Tinea pedis (Athlete's foot): This is a common fungal infection that can cause white spots or patches on the bottom of the feet, often accompanied by itching, scaling, and cracking of the skin.

Pityriasis versicolor: A skin condition caused by a yeast infection, leading to patches of discolored skin, which can appear as white spots, especially in areas prone to moisture like the feet.
Eczema (Dyshidrotic): A type of eczema that can cause small, itchy blisters or dry patches on the feet, sometimes appearing as white spots.
Keratosis pilaris: A harmless condition that causes small, rough patches on the skin, which can sometimes appear on the feet and may be mistaken for white spots.

Lichen planus: An inflammatory condition that can affect the skin and mucous membranes, sometimes presenting with white, lacy patches on the skin, including the feet. Although less common, missing this diagnosis could lead to prolonged discomfort and potential scarring.
Squamous cell carcinoma: A type of skin cancer that can present as a firm, rough patch on the skin, which might initially appear as a white spot. Early detection is crucial for effective treatment.

Pityriasis alba: A mild skin condition more commonly seen in children, characterized by small, round, faint patches on the skin, which can occasionally appear on the feet.
Idiopathic guttate hypomelanosis: A condition characterized by small, discrete, hypopigmented macules, which can appear on the skin, including the feet, often in older adults.
Vitiligo: An autoimmune condition leading to loss of pigment-producing cells, resulting in white patches on the skin. While it can occur anywhere, including the feet, it's less common in this specific location compared to other areas of the body.