Diagnosis of Skin Disease

Yellow and orange in cutaneous lesions: clinical and dermoscopic data

“…In dermoscopic descriptions the colours red, brown and blue have taken on an important role, but other colours like yellow and orange have been given less importance. Thus, orange and yellow colours have been described in very few conditions . Indeed, in dermoscopy yellow colour has been linked just to keratin and lipids, and accordingly, it is seen mostly in keratinizing tumours, tumours with sebaceous differentiation and juvenile xanthogranuloma and, on the other hand, orange colour has been described mainly in granulomatous skin diseases …”

Annular lichen planus‐like keratosis: clues to pre‐existing porokeratosis

“…Annular lesions may result from the centrifugal extension of an infection‐like tinea or an inflammatory process that spreads peripherally and leaves a scar at the center, such as discoid lupus. The presence of a refractory central area resistant to an allergic process has been used as an explanation in urticaria. 10 However, in many diseases, including porokeratosis, the primary lesion is annular at the beginning.…”

Uses of hypodermic needle in dermatology

“…[15] Modifi ed prick test Here, a drop of test solution is placed on the skin than a needle is then inserted very superficially and almost horizontally into the skin and lifted to raise a tiny tent of epidermis, rest is same as in prick test. [15] Chemical cauterization of xanthelasma Here, multiple superficial punctures are made over the surface of xanthelasma lesion with a 24 G or 26 G needle at multiple equidistant points so as to cover the area completely. The tip of sharp toothpick is then dipped in phenol and is reinserted through the earlier needle opening.…”