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).
190 Followers. A. Keratosis pilaris is a very common skin disorder seen in many people of all ages. It is a benign condition that presents as numerous small, rough, red, or tan bumps primarily around hair follicles on the upper arms, legs, buttocks, and sometimes cheeks.. Pilaris Keratosis or Keratosis Pilaris is a harmless skin condition that affects 50-80% of all teenagers and about 40% of all adults, so you are not alone. Keratosis Pilaris are dry, rough patches of skin generally found on the upper arms, thighs or buttocks.