These 2 types of skin lesions can be differentiated as follows: Skin lesions can be seen during a general physical examination in a dermatology clinic. In contrast, secondary skin lesions result from changes over time caused by disease progression, manipulation (scratching, picking, rubbing), or treatment. Leprosy (or Hansen’s disease) is a chronic, progressive bacterial infection that can cause disfigurement and disability if left untreated. Secondary skin lesions result from complications of primary skin lesions. Common benign skin lesions of melanocytic origin include the ephilis, lentigo simplex, and melanocytic naevus (mole). There are several different types, including the macule, papule, vesicle, plaque, bulla, patch, tumor, wheal, nodule, and pustule.These are not specific to one disease, and are not always considered to be a primary lesion. (1) Macule. Types of lesion Basic skin lesions are broadly categorized as : 1. Macule: a flat area of altered colour less than 1.5cm in diameter. Secondary lesions such as scales or ulcers may develop from primary lesions or result from external trauma (e.g., infections, scratching). When describing a skin lesion,it is important to note the following features:- 1)size 2)type 3)shape and symmetry 4)colour and pigmentation 5)surface area 6)Distribution over the body surface 3. A macule (figure 3-3) is a definite area of skin in which the skin color has changed from the normal skin color. Primary skin lesions are present at the onset of a disease. Nevertheless, it is useful to know how the common skin lesions look like to be able to recognise them. There are two kinds of skin lesions. Bulla : a circumscribed, elevated fluid-filled lesion greater than 1 cm in size (e.g. Benign lesions can be classified by their cellular origin: melanocytic, keratinocytic, vascular, fibrous, fat, and so on, Which are the common melanocytic lesions? The skin of elderly persons possesses a greater number of benign growths and neoplasms than the skin of younger and middle-aged persons. Discover the symptoms and see pictures. Skin lesions may be primary or secondary. Primary 2. Black eschars are collections of dead skin that can arise from infarction, which may be caused by infection (eg, anthrax , angioinvasive fungi including Rhizopus, meningococcemia ), calciphylaxis , arterial insufficiency, or vasculitis . From this information, diagnostic possibilities are considered. Primary skin lesion s are basic and simple. Secondary 3. special 4. Primary lesions (e.g., macules or papules) appear as a direct result of a disease process. Patch: a flat area of altered colour greater than 1.5cm in diameter. This findings are recorded as morphology of lesion, the distribution of lesions and the arrangement or grouping of lesions. The majority of skin lesions are benign, but when a new lesion or mark appears on our skin, it can be difficult to tell whether it is dangerous. If you have any suspicions about a mark, mole or lesion, you should ask your doctor to check it. Primary skin lesions are those which develop as a direct result of a disease process. Black skin lesions may be melanocytic, including nevi and melanoma. In this article, I discuss seborrheic keratosis, stucco keratosis, benign melanocytic nevus, cutaneous horn, actinic keratosis, blue nevus, lentigo, and porokeratosis. This area is neither higher nor lower than the surrounding skin area. epidermolysis bullosa, bullous impetigo). Primary lesions are those lesions that arise de novo and are therefore the most characteristic of the desease process. Papule: a solid raised palpable lesion less than 0.5cm in diameter. A primary lesion is a change in the skin that is caused by a certain disease or infection. c. Primary Skin Lesions. 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