AC	adenylate cyclase
AMPK	AMP-activated protein kinase
bFGF	basic fibroblast growth factor
BM	basement membrane
cAMP	cyclic adenosine phosphate
Cer	ceramide
CGRP	calcitonin gene-related peptide
CLC7	chloride channel 7
COC	combined oral contraceptive
COX-2	cyclooxygenase-2
CREB	cAMP-response element binding protein
DDX5	DEAD-Box Helicase 5
ECM	extracellular matrix
EDN1	endothelin 1
EDNRB	endothelin receptor B
ERK	extracellular signal-regulated kinase
ESR	estrogen receptor
ET	endothelin
H2	histamine type 2
HEVL	high-energy visible light
HGF	hepatocyte growth factor
hIUD	hormonal intrauterine device
IGF	insulin-like growth factor
IL	interleukin
KGF	keratinocyte growth factor
LED	light-emitting diode
MAPK	mitogen-activated protein kinase
MC1R	melanocortin 1 receptor
MITF	microphthalm-associated transcription factor
MMP	matrix metalloproteinase
NEP	neural endopeptidase
NGF	nerve growth factor
NGFR	nerve growth factor receptor
OCA2	oculocutaneous albinism 2
OXT	oxytocin
PDL	pulsed-dye laser
PKA	protein kinase A
PKC	protein kinase C
POC	progestin-only contraceptive
ROS	reactive oxygen species
SASP	senescence-associated secretory phenotype
SCF	stem cell factor
SG	sebaceous gland
SLC	solute carrier
SNP	single-nucleotide polymorphism
TPC2	two-pore channel 2
TRPV	transient receptor potential vanilloid
TXA	tranexamic acid
TYR	tyrosinase
TYRP	tyrosinase-related protein
ULC	ultra-long chain
UV	ultraviolet
UVB	ultraviolet B
UVR	ultraviolet radiation
V-ATPase	vacuolar-type ATPase
VDR	vitamin D receptor
VEGF	vascular endothelial growth factor
VL	visible light
VLC	very long chain
αMSH	α-melanocyte stimulating hormone