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Articles
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Diagnosis of Hand, foot, and mouth disease
Hand, foot, and mouth disease is usually diagnosed clinically, meaning doctors identify it from the pattern of signs and symptoms rather than from a single definitive test. This approach works well because the illness has a characteristic presentation in many cases, especially in children. Accurate diagnosis matters because the condition is contagious, the lesions can…
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Diagnosis of Furuncle
A furuncle, commonly called a boil, is a localized bacterial infection that forms in a hair follicle and the surrounding skin. It usually develops when Staphylococcus aureus enters the follicle and triggers a deeper inflammatory response, leading to a painful, pus-filled nodule. Diagnosis is often straightforward because the lesion has a characteristic appearance and behavior,…
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Diagnosis of Pityriasis rosea
Pityriasis rosea is usually diagnosed on the basis of its characteristic clinical pattern rather than by a single definitive laboratory test. In many cases, a clinician can identify the condition from the appearance of the rash, its distribution on the trunk and proximal limbs, and the way it evolves over time. This matters because pityriasis…
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Diagnosis of Pemphigus vulgaris
Pemphigus vulgaris is diagnosed by combining a careful clinical assessment with laboratory confirmation. It is an autoimmune blistering disorder in which the immune system produces antibodies against desmogleins, proteins that help skin cells adhere to one another. When this adhesion is disrupted, the outer layers of the skin and the lining of the mouth can…
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Diagnosis of Pediculosis
Pediculosis is diagnosed primarily by direct identification of lice or their eggs, called nits, on the scalp, body, or pubic hair depending on the type of infestation. In clinical practice, the diagnosis is usually made through careful visual inspection and, when needed, confirmation with a fine-toothed comb or magnification. Accurate diagnosis matters because itching and…
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Diagnosis of Onychomycosis
Onychomycosis is a fungal infection of the nail unit, usually caused by dermatophytes, though yeasts and non-dermatophyte molds can also be involved. It develops when fungi invade the nail plate, nail bed, or surrounding nail structures and gradually alter nail growth and appearance. Because several non-fungal conditions can produce similar nail changes, diagnosis is not…
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Diagnosis of Morphea
Morphea, also called localized scleroderma, is typically identified through a combination of clinical observation and targeted testing rather than a single definitive blood test. The condition causes inflammation and thickening of the skin because of excess collagen deposition in the dermis and, in some cases, deeper tissue. This process can create patches or bands of…