The degree of pruritus 2. The distribution of pruritus 3. The nature and distribution of primary lesions. Primary lesions are important because they are a reflection of the underlying etiology. They are not always present in chronic cases therefore a systematic examination is very important.
Secondary lesions are evolutionary lesions.
The time sequence with which they appear is important for the clinician to make differential diagnoses. The superficial removal of epidermis resulting in oozing and crusting. Abscess Localized collection of pus in a cavity formed by disintegration of tissue. The detachment of cells within the stratum spinosum from one another. Adnexa Appendages of the epidermis, including hair follicles, sebaceous glands, sweat glands, mammary glands, nails, claws, hooves and hair.