Erythema annulare centrifugum: A common, benign condition characterized by ring-shaped erythemas that are often associated with an underlying infection, inflammation, or malignancy. It is the most likely diagnosis due to its prevalence and typical presentation of ring-like lesions.

Tinea corporis (ringworm): A fungal infection of the skin that can cause ring-like erythemas, often with a clear center and a raised border. It's a common condition that can be easily treated with antifungal medications.
Granuloma annulare: A benign skin condition that presents with ring-shaped lesions, often on the hands and feet. It's characterized by a granulomatous reaction in the skin.
Erythema migrans (Lyme disease): An early manifestation of Lyme disease, characterized by a expanding ring-like erythema at the site of the tick bite. It's an important diagnosis to consider in endemic areas.

Erythema multiforme: A skin condition characterized by target-like lesions, which can sometimes appear ring-like. It's often associated with infections, medications, or other underlying conditions, and can be life-threatening if not recognized and treated promptly.
Stevens-Johnson syndrome: A severe skin and mucous membrane disorder, often drug-induced, that can present with ring-like erythemas. It's a medical emergency that requires immediate attention.
Leprosy: A chronic bacterial infection that can cause skin lesions, including ring-like erythemas. It's a rare condition in many parts of the world, but can have serious consequences if left untreated.

Subacute cutaneous lupus erythematosus: A rare autoimmune condition that can present with ring-like erythemas, often in a photodistributed pattern.
Sarcoidosis: A systemic granulomatous disease that can cause skin lesions, including ring-like erythemas. It's a rare condition that can be challenging to diagnose.
Necrobiosis lipoidica: A rare skin condition characterized by necrotic lesions, which can sometimes appear ring-like. It's often associated with diabetes mellitus.