What is Aminolevulinic acid used for?
Last updated September 7, 2026.
**Aminolevulinic acid is a topical photosensitizer used with light therapy to treat actinic keratoses and to help detect some tumors.** It is applied by a clinician and activated with a special light that destroys abnormal cells. It treats actinic keratoses on the face, scalp, and upper arms and can highlight bladder tumors during fluorescence cystoscopy. Expect redness, stinging, and strong sensitivity to light after treatment. Avoid sun and bright indoor light until the treated area heals and tell your clinician about allergies or photosensitizing medicines.
What to do
- **Apply in clinic:** Have ALA applied by trained staff and follow timing instructions for light exposure.
- **Avoid sun:** Stay out of direct sunlight and use protective clothing and sunscreen until the treated area heals.
- **Expect discomfort:** Expect temporary redness, stinging, or swelling after light activation; use prescribed pain relief if needed.
- **Tell your clinician:** Report allergies, pregnancy, or medicines that increase photosensitivity before treatment.
- **Follow-up:** Attend your scheduled follow-up so your clinician can check healing and any remaining lesions.
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