19/01/2010
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Porcine
1
Punctate focal cutaneous black lesions on a pig carcass
In a 6 months old, commercial hybrid pig carcase multiple, sharply demarcated, miliary black lesions were observed. The distribution was bilateral and the spots were a little prominent.
Microscopically lesions corresponded to blackheads (comedones). It consists of follicular cysts filled with keratin, some of them associated with a foreign body inflammatory reaction cyst rupture.
The injury is rarely described in pigs. In other species the origin can be actinic (exposure to sunlight), due to certain endocrine disorders (hyperestrogenism, hyperadrenocorticism), to topical corticosteroids and congenital.
The area of affected skin is well demarcated.
Lesion distribution is bilateral.
Detail of the cutaneous lesion.
1 comment(s)
No està clar l’origen dels mateixos ni la distribució tan ben delimitada i simètrica. Una possibilitat seria que tingués relació amb la migració de les cèl·lules de les crestes neurals, que a nivell de la dermis formaran els melanoblasts. Seria el mateix fenòmen que explica les taques negres i blanques de las races de vaca o porc tacades.