A dermatome is an instrument to cut skin.
The medical term for instrument is "device" or "tool."
CraniotomecraniometerOsteotome
Dermoid is the medical term meaning skin-like
Pyoderma is the medical term meaning any purulent skin condition.
Anoscope is a medical term meaning instrument for the direct visual examination of the anus.
Hyperpigmentation is the medical term meaning excessively darkened skin.
Acrochordon is the medical term meaning skin tag. Skin tags can occur in areas of high friction.
Dermatomycosis is the medical term meaning fungal disease of the skin.
The medical term meaning Tb skin test is Mantoux. It's a term that refers to a skin test to check for tuburculosis.
Hyperpigmentation is the medical term meaning excessively darkened skin.
The top layer of skin is called the epidermis; epidermal is the medical term meaning pertaining to the skin's surface.
Debriding, debridement (of dead tissue); exfoliation; abrasion if it's accidental, or if the entire layer is scraped (torn off), it's known as an avulsion.