Varicella-Zoster Virus (VZV) infection (Shingles): This is the most likely diagnosis, given the description of a shingles-like rash. However, the involvement of both feet is unusual for typical shingles, which usually affects a single dermatome. The presence of a rash on both feet could suggest a disseminated zoster infection or an immunocompromised state.

Contact Dermatitis: An allergic reaction or irritant contact dermatitis could cause a rash on both feet, especially if the individual has been exposed to a new substance or has a history of allergies.
Dyshidrotic Eczema: This condition is characterized by small, itchy blisters on the hands and feet, which could be mistaken for a shingles-like rash.
Psoriasis: Although less common on the feet, psoriasis can cause a rash that might resemble shingles, especially if the patient has a history of the condition.

Syphilis (Secondary): The rash of secondary syphilis can be quite varied and may resemble shingles. Given the potential for serious complications if left untreated, syphilis should be considered, especially in sexually active individuals or those with high-risk behaviors.
Lyme Disease: In its early stages, Lyme disease can cause a rash (erythema migrans) that might be mistaken for shingles, particularly if the patient has been in areas where ticks are common.
Disseminated Herpes Simplex Virus (HSV): Although less common, disseminated HSV can cause a rash that might resemble shingles, especially in immunocompromised individuals.

Pityriasis Rubra Pilaris: A rare skin disorder that can cause a rash on the feet, among other areas, but it typically has distinct characteristics such as palmoplantar keratoderma and follicular hyperkeratosis.
Keratoderma Blennorrhagicum: Associated with reactive arthritis, this condition can cause a rash on the feet that might be confused with shingles, but it is relatively rare and usually accompanied by other symptoms like arthritis and conjunctivitis.