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Hand disinfection (procedure) Systematical hand rubbing with ethanol-containing liquids, to reduce the risk of postsurgical infections.

Link: https://plastsurgeon.com/surgery-preparation/hand-disinfection-2/
Helix (ear)The prominent edge of the auricle of the ear. Frequent localization for actinic keratosis and carcinomas.
HematomaAn accumulation of blood, seen as a consequence of tissue trauma, operation, bleeding disease, medicine, and others. It is often seen post-surgery. The hematoma increases the risk of infection and the formation of an abscess. In many cases, the hematoma becomes so pronounced, that surgical discharge is needed. The hematoma can be drained with a syringe, or by incision with a scalpel in the cicatrice. 
Hemoglobin A protein (Hb), found in the erythrocytes (red blood cells). The function of hemoglobin in the blood is to transport oxygen from the lungs to the tissue.
HemostasisThe process of stopping bleeding. It can be done by the body or as a surgical procedure. In surgery, surgical knots with self-resolving suture and surgical diathermy (bipolar or monopolar, metal probes used for electrocauterization) are used to stop the bleeding blood vessels.
Hemostatic phase (wound healing) The first of four phases in wound healing. In connection to tissue damage is the coagulation process activated, it ensures natural hemostasis by thrombosis in the lesioned blood vessels. Many known diseases affect this phase, as well as treatment with blood-thinning drugs. 

Link: https://plastsurgeon.com/wound-management/phases-of-wound-healing/acute-wound-healing/
HirsutismExcessive hair growth due to increased androgenic effects.
Hypergranulation A non-natural granulation tissue that does not respect the wound edge and therefore grows above normal skin level. The reason for the formation is not known directly, but is probably due to an overproduction of growth factors, possibly in combination with edema. It can be treated by mechanically removing the hyper granulation or applying a thin layer of lapis or silver nitrate.
HyperkeratosisAn increase in the skin’s stratum corneum. Seen by a wide range of skin diseases, as well as by longer mechanical effects.
Hyperpigmented scarA scar that is darker than the surrounding skin.
Hypertrophic scar A thickened and sometimes painful scarring in the area of the primary injury or suture. It develops about a month after the trauma, and will often normalize over time, unlike keloid scars, the hypertrophic scars respect the scars boundary. It can be remedied by injection of local steroids directly into the hypertrophic scar.
Hypopigmented scarA scar that is lighter than the surrounding skin.