Large red spot on the lower back?

A large red spot on the lower back can be a symptom of a variety of medical conditions, including:

- Shingles: A viral infection that causes a painful rash.

- Cellulitis: A bacterial infection of the skin.

- Pressure sore: A wound that forms when skin is exposed to constant pressure.

- Skin cancer: A type of cancer that develops in the skin.

- Allergic reaction: A reaction to an allergen, such as a food or medication.

- Insect bite or sting: A reaction to a bite or sting from an insect, such as a mosquito or bee.

- Trauma: An injury to the skin, such as a cut or scrape.

If you have a large red spot on your lower back, it is important to see a doctor to get a diagnosis and treatment.