A skin lesion is described as any area of the skin that differs from the surrounding skin in terms of color, shape, size, and texture. There are mainly two types of skin lesions: Primary Skin Lesions and Secondary Skin Lesions. In this article we will cover different types of secondary skin lesions.
Types of Secondary Skin Lesions:
- Annular lesions
- Nummular lesions
- Target lesions
Annular lesions are ring-shaped lesions with a center clearing. Granuloma annulare, drug eruptions, dermatophyte infections (e.g., tinea [ringworm]), and secondary syphilis are all examples of annular lesions.
Atrophy refers to a loss of tissue, atrophy is a thinning of the skin that appears dry and wrinkled, similar to cigarette paper. Chronic sun exposure, ageing, and various inflammatory and neoplastic skin diseases, such as cutaneous T-cell lymphoma and lupus erythematosus, can all cause atrophy. Long-term use of potent topical corticosteroids can also cause atrophy.
Crust: A crust is made up of dried sebum, pus, or blood that is usually mixed with epithelial and bacterial debris.
Erosions: Erosions are open areas of skin caused by the loss of a part or all of the epidermis. Erosions can be caused by trauma or by inflammatory or infectious skin conditions.
Excoriation is a punctate or linear abrasion caused by mechanical means (primarily scratching), which normally affects just the epidermis but can also affect the papillary dermis. An excoriation is a linear erosion caused by scratching, rubbing, or picking.
A fissure in the skin is a narrow but deep crack in the skin.
Induration is dermal thickening which causes the cutaneous surface to feel thicker and firmer.
Nummular lesions: Nummular lesions are circular or coin-shaped; an example is nummular eczema.
Scale: Scale is a thickened stratum corneum made up of dry or greasy laminated masses of keratin.
Serpiginous lesions: Serpiginous lesions are linear, branching, and curved. Some fungal and parasitic infections are examples (eg, cutaneous larva migrans)1.
Target lesions (also known as bull’s-eye or iris lesions) are classic for erythema multiforme lesions they look as rings with a central duskiness.
Ulcers: Ulcers occur when the epidermis and at least a portion of the dermis is lost. Venous stasis dermatitis, physical trauma with or without vascular impairment (e.g., decubitus ulcers or peripheral arterial disease), infections, and vasculitis are all possible causes of ulcers.
- 1.Benedetti J. Description of Skin Lesions. msdmanual,com. Published 2019. Accessed 2021. https://www.msdmanuals.com/en-in/professional/dermatologic-disorders/approach-to-the-dermatologic-patient/description-of-skin-lesions