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).
Disseminated Superficial Actinic Porokeratosis (DSAP). It is the most common type of Porokeratosis. It is a non-contagious skin condition. This type of skin disorder is also hereditary; its cause is of genetic origin.inear Porokeratosis. It is also a rare disease as it is also listed as a rare disease but affects both male and female. The skin disorder is characterized by papules and plaques on the body which form a linear pattern.