A Study to Evaluate Efficacy and Safety of Light Dose in Subjects With PWB Treated With Hemoporfin + PDT

Inclusion Criteria:

1. Subject must be 18 to 65 years of age inclusive, at the time of signing the informed consent.
2. Subject is Fitzpatrick skin type I-VI.
3. A male subject must agree to use contraception during the Treatment Period and for at least 6 months after the last dose of study treatment and refrain from donating sperm during this period.

A female subject is eligible to participate if she is not pregnant, not breastfeeding, and at least one of the following conditions applies:

Not a woman of childbearing potential (WOCBP) . OR A WOCBP who agrees to follow the contraceptive guidance during the Treatment Period and for at least 30 days after the last dose of study treatment.

1. The subject has a clinical diagnosis of PWB located on the face and/or neck.
2. The longest diameter of the treatment area is ≥3 cm, and the short diameter is ≥2 cm.
3. Subject is capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol.
4. Subject, in the Investigator's opinion, is in good general health and free of any disease state or physical condition that may impair the evaluation of PWB or expose the subject to an unacceptable risk by study participation.

Exclusion Criteria:

1. Subject is pregnant, lactating, or is planning to become pregnant during the study.
2. Subject has plaque/nodular changes and severe hypertrophy within the target PWB area.
3. Subject has Sturge-Weber syndrome or PWB involving ophthalmic nerves.
4. Subject has any skin pathology or condition that, in the Investigator's opinion, could interfere with the evaluation of the study drug or requires use of interfering topical, systemic, or surgical therapy.
5. Subject is immunosuppressed related to medication use and/or disease.
6. Subject has clinically significant ECG abnormalities at Screening
7. Subject has clinically significant laboratory abnormalities as assessed by the Investigator at Screening.
8. Subject has received any therapy on the treatment region that, in the Investigator's opinion, may affect the target PWB area.
9. Subject is currently enrolled in an investigational drug or device study, including clinical studies in dermatology.
10. Subject has used an investigational drug or investigational device treatment within 30 days prior to C1D1.
11. Subject is known or in the opinion of the Investigator likely to be noncompliant with the requirements of the study protocol (eg, due to alcoholism, drug dependency, mental incapacity).
12. Subject has a history of either significant neurological events (such as major stroke) or a mental condition rendering him/her unable to understand the nature, scope, and possible consequences of the study.
13. Subject has an unstable cardiac disease or has any medical condition that in the opinion of the Investigator may worsen from receipt of study treatment or subject participation.