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).
Keratosis Pilaris (KP) is a very common and completely harmless skin condition. In the population as a whole, keratosis pilaris may affect as many as one person in three. Its name gives some idea of what it is.eratosis Pilaris is a disorder of hyperkeratosis. It is a very common benign condition, which presents as folliculocentric keratotic papules. Although there is no defined etiology, it is often described in association with ichthyosis vulgaris and less commonly with atopic dermatitis.