Actodermatitis
"Infection".
Vasculitis
Melanodermatitis or postinflammatory hyperpigmentation are terms meaning an excess of melanin in an area of skin inflammation.
comedone
contact dermatitis
Dermatomyositis
abscess
Eczema
Erythema means redness of the skin. Erythroderma
Dermoid is the medical term meaning skin-like
The Greek prefix meaning "skin" is "derm-", as in words like dermatology (study of skin) and dermatitis (inflammation of the skin).
Acrochordon is the medical term meaning skin tag. Skin tags can occur in areas of high friction.