What term describes black discoloration in the dermis that cannot be wiped off?

The term that describes black discoloration in the dermis that cannot be wiped off is tattooing. Tattooing occurs when ink or pigments are introduced into the dermis layer of the skin, resulting in permanent markings. This process involves the deposition of specific substances that become embedded in the dermal layer, making the discoloration persistent and resistant to removal by simple means, such as wiping.

Tattooing differs significantly from other forms of skin discoloration or damage. For example, blackening could refer to various causes, such as bruising or necrosis, but these conditions typically can change over time and might not be permanent instantaneously like a tattoo. Burning generally relates to thermal injuries that can cause skin damage, but the discoloration from burns might be temporary and associated with healing processes, rather than a definitive, permanent marking. Scarring is related to the skin's healing response after injury, which can create marks but does not inherently imply the presence of pigmented ink embedded in the skin. Thus, tattooing is the most precise term for black discoloration that is intended to be permanent and cannot be wiped away.