Differential Diagnosis for a Bump on the Chin

Single Most Likely Diagnosis

• Acne or acne cyst: This is a common condition that can cause bumps on the chin due to blockage of the pores and inflammation.

Other Likely Diagnoses

• Ingrown hair or folliculitis: These conditions occur when hair grows back into the skin or when the hair follicle becomes inflamed, often due to shaving or clogged pores.
• Keratosis pilaris: A harmless condition that causes small, rough bumps on the skin, often on the chin, due to excess keratin.
• Lipoma or sebaceous cyst: Benign growths that can appear as bumps under the skin, including on the chin.

Do Not Miss Diagnoses

• Basal cell carcinoma or squamous cell carcinoma: Although less common, these skin cancers can present as bumps on the chin and are crucial to diagnose early for effective treatment.
• Lupus miliaris disseminatus faciei (LMDF): A rare form of cutaneous tuberculosis that can cause bumps on the face, including the chin, and requires prompt diagnosis and treatment.

Rare Diagnoses

• Dermatofibroma: A rare, benign skin growth that can appear as a bump, often after minor injury, and can occur on the chin.
• Trichoepithelioma: A rare, benign tumor of the hair follicle that can cause bumps on the skin, including the chin.
• Sarcoidosis: A condition that can cause small bumps or growths on the skin, including the chin, due to inflammation, although it's more commonly associated with other systemic symptoms.