Abstract
Epidermal cyst also called epithelial cyst is a very common benign skin tumour. They can appear anywhere on the body but are most common on the face, neck and trunk. They are slow growing and often painless. It is usually easy to diagnose. Sometimes, it can be difficult to make a correct diagnosis for non-typical cases such as multiple, small lesions or those lacking a central comedo-like punctum. We here report the case of an epidermal cyst with no clinically visible punctum in which the dermoscopy was very helpful.
Highlights
An epidermal cyst is a common keratin-filled epitheliallined cyst
The punctum is a characteristic of epidermal cyst which is a clinically visible orifice representing the orifice of an obstructed hair follicle from which the cyst originates
The diagnostic application of dermoscopy is increasing in general dermatology and for skin tumors because it enables
Summary
An epidermal cyst is a common keratin-filled epitheliallined cyst It can generally be diagnosed clinically but a biopsy is required for differential diagnosis with other subcutaneous nodules and for determining the best treatment modality. They present as a roughly circular subcutaneous nodule of variable size, of firm consistency, covered by smooth, normal-colored skin with a central punctum [1]. Dermoscopy analysis showed a white-yellow background, telangiectatics vessels, peripheric linear branched vessels and a roughly circular orifice filled with keratin corresponding to the punctum [Fig 2] This last finding made us think of the possibility of an epidermal cyst which was confirmed by the histology report after the excision of the nodule
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