Coal forms from the accumulation of plant debris, usually in a swamp environment. When plant debris dies and falls into the swamp the standing water of the swamp protects it from decay. Swamp waters are usually deficient in oxygen, which would react with the plant debris and cause it to decay.
Porokeratosis is generally considered to be a benign condition though malignant transformation has been seen in all but the punctate variety, necessitating regular followup of patients with porokeratosis (Maubec et al., 2005; Sasson & Krain, 1996).
Ptosis is a common condition and, fortunately, the majority of etiologies are benign. However, a few history and examination points can rule out dangerous causes of ptosis. The simple mantra of âupper lid, pupils, and EOMsâif one is abnormal check the other twoâ cannot be overemphasized. REVIEW.