The purpose of this research project is to study the effectiveness of high dose UVB (290-320nm at up to 320mJ/cm2) irradiation for the treatment of skin conditions with altered dermal matrix in patients with increased skin pigmentation. These disorders include but are not limited to keloid (or hypertrophic scar), scleroderma, acne keloidalis nuchae, old burn scars, and granuloma annulare. Up to fifty patients with one of these diagnoses or related conditions will receive UVB irradiation up to 5 times per week, for 16 weeks.