PDT	Photodynamic Therapy
DL-PDT or dPDT	Daylight-Photodynamic Therapy
AKs	Actinic Keratoses
PpIX	Protoporphyrin IX
SCC	Squamous Cell Carcinoma
ALA	5-Aminolevulinic Acid
MAL	Methyl Aminolevulinate
5-FU	Topical 5-Fluorouracil
RF	Radiofrequency
TMFI	Thermomechanical Fractional Injury
MD	Microdermabrasion
LEDs	Light-Emitting Diodes
Er-YAG	laser: Erbium:Yttrium–Aluminum–Garnet
AFL-PT	Er:YAG-ablative fractional laser-assisted PDT
IDL	Indoor Daylight
GA	Glycolic Acid
EDTA	Ethylenendiamine-tetra-acetic-acid
DMSO	Dimethylsulphoxid