... pigmented keratinocytes. Yellow-brown in colour, they range from dark yellow to black and can be divided into: • seborrheic keratoses, with internal horny pseu-docysts • actinic or senile ... treated by a variety of methods including electrocoagulation, cryotherapy, acid chemical agents (Trichloroacetic acid) and depigmenting agents (Hydrochinone), and C02, Ruby, Argon Laser systems ... University of Bari, Italy Correspondence to: Dr. Andrea BALLINI, PhD., Department of Dental Sciences and Surgery, University of Bari, Bari, Italy, Faculty of Medicine and Surgery, University of...