Dermatology & Hair Care
Published on 2 November 2026
Answered & medically reviewed by
Dr Lalita Agarwal✓ Doctor verified
MBBS, MD / Postgraduate Degree in Medical Microbiology • 29 years experience
Can Phototherapy Cause Permanent Skin Darkening?
No, phototherapy generally does not cause permanent skin darkening. The UV light used during treatment stimulates melanin production, which can make your skin appear temporarily darker or tanned. This pigmentation usually fades gradually over a few weeks or months after completing treatment. Your dermatologist monitors your skin throughout the sessions to minimise the risk of overexposure. If the darkening persists or becomes more noticeable, consult your dermatologist.
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