Primary lesions - Characterized by flat, non-palpable changes in skin color or by elevations formed by fluid in a cavity, such as a vehicle or pustules., Bulla - Blister containing a watery fluid, similar to a vehicle, but larger., Cyst - A closed, abnormally developed sac, containing fluid, infection, or other matter, above or below the skin. Acne is one type, Macule - Flat or discolored spot or patch on the surface of the skin, such as freckle or spot, left after a pimple has healed. are not raised or sunken., Nodule - Often referred to as tumors, but they are smaller bumps caused by conditions such s scar tissue, fatty deposits, or infections., Papule - A small elevation on the skin that contains no fluid, but may develop into pustule. They are less than half an inch in diameter, may have a varied appearance in color, and are either rounded, smooth, or rough., Pustule - An inflamed papule with a white or yellow center containing pus, a fluid consisting of white blood cells, bacteria and other debris; a small pus.containing blister that may or may not be caused by infection. Acne in this in hair follicles are not infectious, Tubercle - An abnormal rounded, solid lump; larger than a papule, Tumor - An abnormal cell mass (a large nodule) resulting from excessive cell multiplication, varying in size, shape and color., Vesicle - Small blister with clear fluid; lies within or just beneath epidermis such as poison ivy., Wheal - Itchy, swollen lesion caused by a blow, insect bite, skin allergy reaction, or stings. Hives and mosquito bites are wheals. Hives are called urticaria and can also be abused by exposure to allergens used in products.,

Primary lesions

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