What rash do I have on my back?

Common back-rash causes, quick symptom checks, and a fast way to get a real AI analysis.

Skip the quiz — get an actual analysis

Quizzes can suggest possibilities but they can't see your skin. Rash Detector analyzes three real photos and returns a detailed AI report — detected abnormalities, condition information, risk assessment, and a clear summary — in about a minute.

Run an AI analysis instead

Common causes of back rashes

Acne (back acne / 'bacne') from sweat and friction
Heat rash and miliaria
Tinea versicolor (fungal pigment changes)
Folliculitis from blocked hair follicles
Psoriasis — lower back is common
Shingles — typically wraps around one side

Quick symptom checks

These checks can help you narrow down what you might be dealing with — but they are not a diagnosis. Run a Rash Detector report for a structured AI analysis, and consult a healthcare professional for diagnosis and treatment.

Painful blistering rash on one side of the back only?

Could be shingles. Seek urgent care — early antivirals help significantly.

Multiple small light/dark patches that don't tan?

Often tinea versicolor. Antifungal treatments help.

Itchy red bumps after a workout?

Likely heat rash or folliculitis. Shower promptly after sweating.

Pimples and inflamed bumps spread across upper back?

Likely back acne. Salicylic acid washes and avoiding tight clothes can help.

When to see a doctor

Seek medical attention if your rash is spreading rapidly, becoming painful, accompanied by fever, draining pus, or accompanied by difficulty breathing. Rash Detector is an awareness tool, not a diagnostic device.

Three photos. One report. About a minute.

Get a structured AI analysis instead of guessing.

Get your Rash Detector report