acne vulgaris	skin disease caused by overactivity of sebaceous glands
ambulatory	people treated out with the hospital setting
angiomas	dilatation or new formation of blood vessels
arterioles	small branches of an artery
atrophic blanche	small smooth ivory‐white areas on the skin with hyperpigmented borders and telangiectasias
chromophore	chemical group that absorbs light at a specific frequency
dermal	relating to skin and specially to the dermis
dorsum	the dorsal part of an organism
endothelium	tissue that forms a single layer of cells lining various organs
epidermal	nonsensitive layer of the skin
erythema	superficial reddening of the skin
extravasation	escape of blood from a vessel into the tissues
fibrosis	the thickening and scarring of connective tissue
hypopigmentation	decreased pigmentation of an area of the skin
hyperpigmentation	increased pigmentation of an area of the skin
lipodermatosclerosis	chronic fibrosing panniculitis associated with venous insufficiency
matting	new telangiectasis after treatment
melanin	pigment responsible for determining skin and hair colours
microthrombi	small thrombus (blood clot formed in situ within the vascular system)
necrosis	death of most or all of the cells in an organ or tissue
occlusion	blockage of blood vessel
oedema	excess of watery fluid collecting in the tissue of the body
osmotic	diffusion of fluid through a semipermeable membrane
oxyhaemoglobin	substance formed by the combination of haemoglobin with oxygen
periorbital	tissues surrounding or lining the orbit of the eye
photocoagulation	coagulation of tissue using a laser or other intense light source
photothermolysis	a method of laser skin resurfacing
polychromatic	various wavelengths or frequencies
recanalisation	process of restoring flow of the blood vessels
subcutaneous	situated or applied under the skin
subdermal	situated or lying under the skin
thermocoagulation	coagulation of tissue with high‐frequency currents
thermosclerosis	coagulation of blood vessels for heat
thrombosis	local coagulation or clotting of the blood in a part of circulatory system
vascular	relating to blood vessels
venous	relating to a vein
venules	very small veins
vesicles	small fluid‐filled bladders, sacs, or cysts