DermExcel™ treatment for Teenager Acne Grade 2. Mild to moderate acne. Greater number of comedones (congested pores/blackheads) accompanied by papules (bumps) and mild pustules (pimples). Occasionally, deeper inflamed lesions will also develop. Thorough exfoliation is required to keep this level of acne in check. If left untreated there is a high chance that it will progress to grade 3.