Small fluid-filled blister on the skin that is less than 5 mm in diameter
Bulla
A fluid-filled sac that appears when fluid is trapped under a thin layer of the skin. It is also a type of blister but it is more than 5 mm in diameter
Macule
A flat skin lesion, a small patch of skin that is altered in color
Pustule
A small bump on the skin that contains pus
Papule
A flat with elevated surface. A solid palpable lesion that is less than or equal to 5 mm in diameter. They can be solitary or multiple
Plaques
Are flat with elevated surface that is more than 5 mm in diameter
Nodules
Are rounded raised lesions more than 5 mm in diameter
Urticaria (Wheals and Hives)
Annular or ring-like papules or plaques with pinkish in color. They are seen in allergic reactions
Petechiae
Skin bleeding lesions with less than 3 mm in diameter. They are seen in dengue patients
Purpura
Skin bleeding lesion greater than 3 mm in diameter. They are seen in Meningococcemia patients
Ecchymosis
Skin bleeding lesion with greater than 3 mm in diameter. They are also known as "Black eye"
