We developed reproducible guidelines to most effectively treat a variety of skin types and conditions using nonablative fractional photothermolysis. Future large, multicenter trials are indicated for further optimization of treatment parameters.

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PDT has been shown to be of value in inoperable basal and squamous skin cancers and in cutaneous metastases. Azone, a new investigative vehicle for HpD, is of value more for intralesional injections than for topical applications in tumors, except perhaps for superficial mucous membrane lesions. The more flexible gold head vapor is of definite value in the PDT program. For test models for PDT studies in dermatology and plastic surgery with HpD and other fluorochromes, single thickened resistant plaques of psoriasis and the common baso squamous acanthoma (seborrheic warty growth) have been used. In all these studies, adequate controls are necessary.