Photodynamic therapy for skin lesions: treatment and recovery

Many people feel ready to return to work 3 to 5 days after photodynamic therapy for skin lesions. If your role involves face-to-face contact, you may prefer to allow 1 to 2 weeks for redness to settle. Recovery varies with the treated area and how your skin responds.

It’s understandable to wonder whether treatment will affect your work, appearance or usual routine. Knowing what to expect can make planning easier, particularly if the treated skin is red or tender while it heals.

This article explains how photodynamic therapy works, which lesions it may treat and what recovery can involve. It also covers possible side effects, light precautions and factors that may affect your return to work.

What photodynamic therapy is and which lesions it treats

Photodynamic therapy (PDT) combines a light-sensitive medicine with light to target abnormal cells in a specific treatment area. Australians can begin with a GP assessment; referral arrangements depend on the service pathway. For suitable diagnoses, photodynamic therapy for skin lesions is a local treatment rather than treatment for the whole body.

Lesions treated with PDT

Photodynamic therapy for skin lesions may be used for actinic keratoses, superficial basal cell carcinoma and Bowen’s disease, also called squamous cell carcinoma in situ. These are precancerous or superficial non-melanoma skin lesions. The medicine makes targeted cells sensitive to light, helping treatment act on the affected area. The diagnosis, including the lesion’s type and depth, helps determine whether PDT may be suitable.

Other conditions treated with PDT

PDT also has uses beyond skin cancer. Depending on the condition and treatment area, it may be used for acne, psoriasis and some bacterial, fungal or viral infections. Other applications include age-related macular degeneration and certain cancers. These uses involve different treatment settings, so PDT is not suitable for every disease. For a skin concern, the specific diagnosis is central to considering photodynamic therapy for skin lesions.

Candidate suitability and treatment limits

Suitability depends on the diagnosis, lesion depth and treatment history. Skin cancers greater than 2 mm thick are generally unsuitable, as are melanoma and invasive squamous cell carcinoma. PDT is also unsuitable for morpheaform or sclerosing basal cell carcinoma, or cancers that have returned after previous treatment. It isn’t recommended during pregnancy or for people with porphyria. After treatment, avoid direct light for at least 48 hours. A scab may form within a few days, while healing can take a few weeks, depending on the body part treated.

What are the possible side effects of PDT?

With conventional PDT for skin lesions, photosensitising cream is applied to the treatment area and absorbed for around 3 hours. A red LED light then activates the medicine in the treated skin. The light activation itself takes 8 to 10 minutes. The photosensitiser is nontoxic until light activates it, but the treatment can still cause a noticeable local reaction.

Light activation and possible reactions

During light activation, patients may feel discomfort in the sensitive treatment area. Cooling water spray, cold packs or local anaesthetic can help manage it when needed. Daylight PDT is generally associated with less discomfort than conventional LED treatment. Afterward, the treated area may develop a sunburn-like reaction. Redness and soreness can be followed by blistering, ulceration or a scab, and healing may take several weeks.

Aftercare and recovery

After conventional PDT, a dressing is usually kept on for two days to limit further light exposure. Avoid direct light for at least 48 hours after treatment. If the treated skin can’t be covered outdoors, SPF 50 sunscreen is essential during outdoor activities for 48 hours. PDT-related skin photosensitivity usually lasts about 24 hours, depending on the photosensitising agent. Follow the aftercare instructions for your treatment and protect the area from light.

The sunburn-like reaction usually heals within 4 to 8 weeks, though healing depends on the body part treated. Many patients feel comfortable returning to work 3 to 5 days after PDT. If your role involves public-facing work, you may prefer to allow 1 to 2 weeks for redness to settle. For advice about a lesion and possible next steps, a skin cancer check can help clarify the care needed.

How photodynamic therapy works

PDT uses a photosensitiser, a medicine activated by light, to target abnormal cells. Once activated, it can damage those cells and help trigger the body’s immune response. For skin lesions, light is directed at the treatment area, keeping the process local.

The main difference is the light source: daylight PDT uses indirect natural daylight, while conventional PDT uses a red LED. Daylight treatment for actinic keratoses involves about 2 hours outdoors; conventional treatment uses a set period of cream absorption followed by focused LED exposure.

With conventional LED PDT, photosensitising cream is applied to the lesion and left for around 3 hours before activation. This gives the medicine time to enter the superficial abnormal tissue. A red LED is then aimed at the area for 8 to 10 minutes. Artificial-light PDT sessions can last 5 to 45 minutes, depending on the treatment. Light activates the photosensitiser, creating a response that damages targeted cells. The medicine remains nontoxic until this activation occurs.

For daylight PDT, cream or gel is applied before the patient goes outdoors within 30 minutes. Indirect natural daylight activates the photosensitiser during around 2 hours outside. This approach is used for actinic keratoses when outdoor conditions are comfortable for the full period and the temperature is over 10 °C. Daylight treatment is generally associated with less discomfort than conventional LED PDT. Weather and comfort therefore matter to whether this method is suitable on the day.

Other PDT applications can use a photosensitiser taken by mouth, applied to the skin or given through an IV, depending on tumour location. In some applications, it is allowed 24 to 72 hours to leave most healthy cells before light exposure. For skin treatment, the cream-based timing differs. The lesion and chosen method determine how the sensitiser and light source are used.

Skin lesions suitable for photodynamic therapy

In Australia, PDT may be used for actinic keratoses, superficial basal cell carcinoma and Bowen’s disease. These are precancerous or superficial skin lesions, but PDT is not suitable for every skin cancer.

Suitability depends on the lesion’s diagnosis, depth and treatment history. A superficial basal cell carcinoma differs from a deeper or invasive cancer, because PDT light treats only a limited depth of tissue. Skin cancers greater than 2 mm thick are generally unsuitable. Lesions that have returned after earlier treatment also fall outside suitable cases. These factors help distinguish a lesion that may respond to local light treatment from one needing another approach.

The diagnosis matters as much as the lesion’s appearance. Melanoma and invasive squamous cell carcinoma are not suitable for PDT. Morpheaform or sclerosing basal cell carcinoma is also unsuitable, although some other superficial basal cell carcinomas may be treated. This is why a clinician assesses the specific cell type and pattern, rather than relying on visible size or colour alone. PDT is not recommended during pregnancy or for people with porphyria.

Depth creates a practical limit: PDT light can treat tissue to about 1/3 inch, while a cancer thicker than 2 mm is generally unsuitable. The figures describe separate treatment considerations, not a guarantee that a lesion within the light’s reach is appropriate. For example, a superficial actinic keratosis may be considered, while an invasive cancer is not. Treatment choice also considers whether the lesion is new or recurrent and its precise diagnosis.

If you’re concerned about the appearance of skin after lesion treatment, you can discuss cosmetic care at the clinic.

Heatley Medical & Skin Care Centre: General Practice

Heatley Medical & Skin Care Centre provides General Practice and skin cancer checks and surgeries, including photodynamic therapy. If you’re concerned about a lesion or considering treatment, a consultation can assess your skin and discuss suitable care. A skin cancer check is a practical starting point if you’ve noticed a change or want a lesion assessed. The appropriate treatment depends on the diagnosis and features, including whether PDT is suitable.

You can discuss recovery and aftercare as part of your care. Heatley Medical & Skin Care Centre provides a setting to talk through your skin health concerns and care options. Contact the clinic to discuss your concerns or arrange a consultation.

Take the next step with confidence

Deciding whether photodynamic therapy for skin lesions suits you starts with a clear conversation about your diagnosis and priorities. Consider what matters in your daily routine, such as time away from work, visible healing or protecting the treated area outdoors. Sharing these concerns can make the discussion practical and focused. The right treatment depends on the lesion’s diagnosis and your individual circumstances.

Note any changes you’ve noticed and bring questions about treatment and recovery to your appointment. Having those details ready can make it easier to understand the options and agree on a manageable plan.

For a considered discussion about your skin health, contact Heatley Medical & Skin Care Centre. Taking that first step can help you feel clearer about what comes next.

Frequently Asked Questions

Can I return to work after PDT?

Many patients feel comfortable returning to work 3 to 5 days after treatment. If your work involves regular face-to-face contact, you might prefer to allow 1 to 2 weeks for redness to settle. Consider the visibility of the treated area and the demands of your role when planning time off. For example, a public-facing worker may choose a later return than someone working from home.

How long does PDT treatment take?

The time required depends on the treatment method and preparation. Conventional PDT includes around 3 hours for the cream to absorb, followed by 8 to 10 minutes under red LED light. Artificial-light sessions can run from 5 to 45 minutes. Daylight treatment involves around 2 hours outdoors. Ask how your planned appointment is structured so you can organise your day around preparation and treatment.

Can PDT be repeated?

Yes, PDT can involve more than one treatment session. Superficial skin cancers typically require two sessions, spaced 1 to 4 weeks apart. A second treatment cycle can also be given 7 to 10 days after the first, depending on the lesion and photosensitising chemical. The treatment plan reflects the diagnosis and the medicine used, so confirm the planned schedule before arranging work or other commitments.

Does Medicare cover PDT?

A Medicare rebate for PDT isn’t automatic. It depends on the service billed and your circumstances. Before treatment, ask the practice which item number applies and whether a rebate is expected. This can help you understand the likely out-of-pocket amount and plan ahead. Keep billing information with your appointment details so you can refer to it when reviewing your treatment arrangements.

How much does PDT cost?

The article does not provide a price. Treatment costs may depend on the case, including the treatment area, method and number of sessions. Before proceeding, ask what the quote covers and whether it relates to one session or a planned course. Knowing the intended schedule can help you understand the full treatment commitment, rather than considering only the first appointment.

How is PDT given?

For skin lesions, PDT commonly involves applying a photosensitising cream or gel to the treatment area, then activating it with daylight or a red LED. Other applications may use medicine taken by mouth or given through an IV, depending on tumour location. The method for your lesion determines the preparation and light source. Follow the specific instructions provided for your treatment.