Ossification of the skin occurs in various lesions. There are two major forms of cutaneous ossification. Primary cutaneous osteoma is a primary tumor without a preceding cutaneous lesion. And secon­dary ossification, that is secondary osteoma cutis, has preexisting lesions, such as pilomatricoma, basal cell carcinoma, acne, melanocytic nevi, cellular blue nevus, epidermal cyst, or malignant melanoma.

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A 26-year-old Korean woman presented to our outpatient clinic who had suffered from a small asymptomatic pigmented nodule on the right of her forehead for several months. There was no evidence of Albright’s hereditary osteodystrophy or Gardner’s syndrome in either the patient or her family. On the physical examination, 0.5 x 0.5 cm sized, relatively well defined, brownish nodule was seen on the right of her forehead (Fig. 1). It gave the clinical im­pression of an intradermal nevus. The lesion was excised totally for histopathologic examination.

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INTRODUCTION

Secondary cutaneous osteomas have been reported in various lesions, including acne, melanocytic nevi, cellular blue nevus, pilomatricoma, epidermoid cyst, basal cell carcinoma, squamous cell carcinoma, or malignant melanoma. Among these, melanocytic nevus associated with one or several foci of cutaneous ossification, is known as nevus of Nanta. In several large series of reports in international literature, the nevus of Nanta was the single most common lesion with cutaneous osteoma formation. To the best of knowledge, only one case of Nanta nevus has been reported in Korean dermatologic literature. …Read the rest of this article

Paedures dermatitis is an acute irritant contact dermatitis caused by insects of the Genus Paederus, Family Staphylinidae, Order Coleoptera. The genus Paederus consists of over 600 species which are distributed worldwide. The major species found in Kenya are the Paederus sabaeus and the Paederuscrebrepunctatus, known the ” airobi Fly,/3, while Paederus fuscipes is the only reported scecies to have caused Paederus dermatitis in Korea. Morphologi­cally, Paederus beetles, range from 5 mm to 10 mm in length, have a narrow, elongated body with a black head, and may resemble ants. They can fly, but they prefer to crawl or run. They do not bite or sting, but accidentally brushing against the skin or being crushed on the skin results in secretion of paederin as a defense mechanism. Paede­rus dermatitis on the dorsum of the left hand.

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A 33-year-old Korean man who had been in Kenya on missionary work was presented with a linear, brownish hyperpigmentation with background hypopigmentation on his left cheek and left hand (Fig. 1). He woke up a month ago to discover erythematous, pinhead-sized blisters in a linear pattern on his left cheek (Fig. 2) and left hand, accompanied by a stinging and burning sensation. The local clinician diagnosed it as Paederus derma­titis caused by ” Le Nairobi fly. He told us that the local population called this clinical picture ” Lght burn” and ” ic Nairobi fly” indicating Paederus sabaeus or Paederus crebrepunctatus. This is commo­nly seen in Kenya, and the insect causes Paederus dermatitis simply by only brushing against the skin or being crushed onto it, usually while the victims are asleep. …Read the rest of this article

INTRODUCTION

Paederus dermatitis is an irritant contact derma­titis characterized by a linear lesion with vesicles, bullae and pustules on an erythematous base. It is caused by insects which belong to the genus Paederus of the Staphyhnidae family. These insects are widely distributed all over the world in damp, moist areas. They also increase in large numbers after heavy rain and hot weather. Therefore, Paederus dermatitis is usually seen in regions with a hot, tropical climate. There have been a few reports of Paederus dermatitis caused by Paederus fuscipes in Korea since 1968. …Read the rest of this article

Neurofibromas may occur as a solitary tumor or as multiple lesions in a segmental or widespread distribution, referred to as neurofibromatosis. Neuro­fibromas are complex proliferations of the various components of the neuromesenchyme, including Schwann cells, endoneurial fibroblasts, perineural cells, and mast cells. In this complex proliferation, however, the proportion of each cell type varies, pro­viding the broad histologic manifestation of neuro­fibromas. There are several distinct types of neuro­fibromas: cutaneous type, subcutaneous type, nodular plexiform type, and diffuse plexiform type. To our knowledge, none of these have previously been described in association with alopecia in the literature to date.

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