Follicular Occlusion Triad: This term was coined by Pillsbury, Shelley & Kligman in 1956 for the common association of acne conglobata, hidradenitis suppurativa, and dissecting cellulitis of the scalp. They proposed that the pathologic event unique to each disease was follicular hyperkeratinisation.
Melkersson-Rosenthal Syndrome: Lingua plicata (fissured or furrowed tongue), facial paralysis/ptosis and granulomatous cheilitis define the clinical triad of Melkersson-Rosenthal syndrome.
Yellow Nail Syndrome: Yellow nail syndrome is the triad of yellow nails, primary lymphedema, and pleural effusion.
Klippelâ€“Trenaunay Syndrome: It consists of triad of capillary malformations (port-wine stain/ naevus flammeus), venous malformations (abnormal varicosities, persistent embryonal veins, and sometimes agenesis of deep veins or avalvulosis), with disproportionate limb growth of soft tissue and/or bone.
Adiposis Dolorosa (Dercum's Disease): It is characterized by classic triad of painful deposits of adipose tissue occurring over multiple areas of the body, ecchymoses and obesity, appearing usually in post menopausal women with amenorrhoea and neurotic symptoms.
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