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hair follicle
A cylindrical invagination
or cavity in the epidermis which penetrates to the dermis and
subcutaneous tissue. The cavity where the hair is produced and grows to
emerge from the skin's surface.
hair follicle bulb (hair
bulb)
The lower, expanded
portion of the hair follicle in which exists the area of active cell
division (hair matrix). The base of the bulb is indented by the dermal
papilla.
hair matrix
Actively dividing cells
within the hair follicle bulb, producing the hair and inner root sheath.
hair root
Refers to any of the hair
below the skin surface, but is often used to refer to that portion of
the hair follicle that must be destroyed to prevent regrowth.
hair shaft
Refers to hair portion
above the skin surface. But in common usage, often refers to any portion
of the hair including that which is below the skin surface.
hair shaft bulb
The expanded lower end of
a tweezed hair. Telogen club hairs tend to be white in appearance, while
anagen club hairs usually appear dark or black.
herpes simplex
Cold sore.
herpes zoster
Shingles.
high frequency blowout
Excessive use of high
frequency treatment energy characterized by a popping and crackling
sound during treatment. May result in pitted scarring.
high frequency current
When pertaining to hair
removal, high frequency (alternating) current generates heat in the
surrounding tissues, such as the hair follicle during thermolysis
treatment.
hirsute
Relating to or
characterized by hirsutism. Excess hair.
hirsutism
Presence of excessive
bodily and facial terminal hair, in a male pattern, especially in women;
may be present in normal adults as an expression of an ethnic
characteristic or may develop in children or adults as the result of
androgen excess due to tumors or drugs, or nonandrogenetic drugs.
Apert's h. Hirsutism caused by a virilizing disorder of
adrenocortical origin.
constitutional h. Mild to moderate degree of hirsutism present in
an individual exhibiting otherwise normal endocrine and reproductive
function.
idiopathic h. Traditionally thought to be of uncertain
origin in women, who may additionally exhibit menstrual abnormalities
and infertility. But, idiopathic hirsutism is the result of any of a
variety of androgenizing factors present.
hormones
Chemical secretions
produced by one of the endocrine glands and carried by the blood stream
to another part of the body to stimulate functional activities.
hydroquinone
The active ingredient,
hydroquinone, found in 2% concentrations in over-the-counter "fade
creams." Used in the treatment of hyperpigmentation.
hyperandrogenism
Excess androgens. The
cause of unwanted hair in male-to-female transgendered individuals.
hyperhydrosis
Excess sweating.
hyperpigmentation
Areas of excess pigment
production. Sometimes seen as darkened spots as a consequence or
adverse reaction of electrolysis treatment. For treatment, see
hydroquinone.
hypertrichosis
Excess hair relative to
the age, sex or body region, not necessarily related to excess
androgens.
hypopigmentation
Areas of reduced pigment.
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