According to level of contamination, a<unk>  can be classified as: * Clean<unk>  – made under sterile conditions<unk> here there are no organisms present, and the skin is likely to heal<unk> ithout complications. * Contaminated<unk>  – usually resulting from accidental injury; there are pathogenic organisms and foreign bodies in the<unk> . * Infected<unk>  – the<unk>  has pathogenic organisms present and multiplying, exhibiting clinical signs of infection (yellow appearance, soreness, redness, oozing pus). * Colonized<unk>  – a chronic situation, containing pathogenic organisms, difficult to heal (e.g. bedsore). Open Open<unk> s can be classified according to the object that caused the<unk> : * Incisions or incised<unk> s – caused by a clean, sharp-edged object such as a knife, razor, or glass splinter. * Lacerations – irregular tear-like<unk> s caused by some blunt trauma. Lacerations and incisions may appear linear (regular) or stellate (irregular). The term laceration is commonly misused in reference to incisions. * Abrasions (grazes) – superficial<unk> s in<unk> hich the topmost layer of the skin (the epidermis) is scraped off. Abrasions are often caused by a sliding fall onto a rough surface such as asphalt, tree bark or concrete. * Avulsions – injuries in<unk> hich a body structure is forcibly detached from its normal point of insertion. A type of amputation<unk> here the extremity is pulled off rather than cut off.<unk> hen used in reference to skin avulsions, the term 'degloving' is also sometimes used as a synonym. * Puncture<unk> s – caused by an object puncturing the skin, such as a splinter, nail or needle. * Penetration<unk> s – caused by an object such as a knife entering and coming out from the skin. * Gunshot<unk> s – caused by a bullet or similar projectile driving into or through the body. There may be two<unk> s, one at the site of entry and one at the site of exit, generally referred to as a "through-and-through." *Critical<unk> s- Including large burns that have been split. These<unk> s can cause serious hydroelectrolytic and metabolic alterations including fluid loss, electrolyte imbalances, and increased catabolism Closed Closed<unk> s have fewer categories, but are just as dangerous as open<unk> s: * Hematomas (or blood tumor) – caused by damage to a blood vessel that in turn causes blood to collect under the skin. * Hematomas that originate from internal blood vessel pathology are petechiae, purpura, and ecchymosis. The different classifications are based on size. * Hematomas that originate from an external source of trauma are contusions, also commonly called bruises. * Crush injury – caused by a great or extreme amount of force applied over a long period of time. File:Finger abrasion.An open<unk>  (an avulsion) File:Laceration, leg.A laceration to the leg Image:Footpuncture.An infected puncture<unk>  to the bottom of the forefoot. Image:Knee puncture.A puncture<unk>  from playing darts. File:Finger cut.An incision: a small cut in a finger. Image:Schnitt in Fingerkuppe.Fresh incisional<unk>  on the fingertip of the left ring finger. File:ASC Leiden - Coutinho Collection - E 39 - Infirmary in Candjambary, Guinea-Bissau - Cleaning the<unk>  - 1974.Abrasion of the lower leg. Guinea-Bissau, 1974
Wound
Soft tissue
Injection port
Coagulation
Body fluid
Biomedical tissue
Surgical instrument
Fluid compartments